<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_us-gaap_BusinessCombinationsAbstract_466DEC95B1F82F59CEFCE24780E04FB9_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationsAbstract_466DEC95B1F82F59CEFCE24780E04FB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combinations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationsAbstract" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_466DEC95B1F82F59CEFCE24780E04FB9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_466DEC95B1F82F59CEFCE24780E04FB9" xlink:to="lab_us-gaap_BusinessCombinationsAbstract_466DEC95B1F82F59CEFCE24780E04FB9" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Combination Disclosure [Text Block]</link:label>
    <link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationDisclosureTextBlock" xlink:label="loc_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A" xlink:to="lab_us-gaap_BusinessCombinationDisclosureTextBlock_4601D1D8B817C5BD3888E24A9543960A" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition, Pro Forma Information [Text Block]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Pro Forma Information [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD" xlink:to="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_9D6128BB88BDDF672E0AE24780E03EBD" xlink:type="arc" />
    <link:label id="lab_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D_label_en-US" xlink:label="lab_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Abstract]</link:label>
    <link:label id="lab_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D_documentation_en-US" xlink:label="lab_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Significant Accounting Policies [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_SignificantAccountingPoliciesAbstract" xlink:label="loc_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D" xlink:to="lab_htld_SignificantAccountingPoliciesAbstract_483FA878AD5C9FA02177049EB45C501D" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income</link:label>
    <link:label id="lab_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00" xlink:to="lab_us-gaap_NetIncomeLoss_398F799731C1DC3CC691049EB45CDA00" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_9D35FC73DB4FF7221335049EB45C596F" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basic EPS</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806" xlink:to="lab_us-gaap_EarningsPerShareBasic_A1CBE2F42FE3A7AAC820049EB45CD806" xlink:type="arc" />
    <link:label id="lab_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D_terseLabel_en-US" xlink:label="lab_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units</link:label>
    <link:label id="lab_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D_label_en-US" xlink:label="lab_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits" xlink:label="loc_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D" xlink:to="lab_us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits_835850FA3D55DAFCA008049EB45C316D" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393_terseLabel_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Share-based Payment Arrangements</link:label>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393_label_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393" xlink:to="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_1DFDE3842F8D8E631E88049EB45CE393" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Diluted</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_D253F3028F395B7776BE049EB46C7D90" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626_totalLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_54CD53638399B2276E72049EB46C0626" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Diluted EPS</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5" xlink:to="lab_us-gaap_EarningsPerShareDiluted_85849BA7B8EEE3698D62049EB46C81E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_153F7EFB40A264AC19E7049EB4BA9344_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_153F7EFB40A264AC19E7049EB4BA9344" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_153F7EFB40A264AC19E7049EB4BA9344" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_153F7EFB40A264AC19E7049EB4BA9344" xlink:to="lab_us-gaap_IncomeTaxDisclosureAbstract_153F7EFB40A264AC19E7049EB4BA9344" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373" xlink:to="lab_us-gaap_IncomeTaxDisclosureTextBlock_36F5D7345EBA52AC5521049EB4BAF373" xlink:type="arc" />
    <link:label id="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248_terseLabel_en-US" xlink:label="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Health insurance reserves</link:label>
    <link:label id="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248_label_en-US" xlink:label="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Health insurance reserves</link:label>
    <link:label id="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248_documentation_en-US" xlink:label="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Self insurance health insurance reserves for estimated cost of health related claims, including estimated expenses incurred but not reported</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_HealthInsuranceReserves" xlink:label="loc_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:to="lab_htld_HealthInsuranceReserves_99ECF56E93D9BB798580049EB4C92248" xlink:type="arc" />
    <link:label id="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C_terseLabel_en-US" xlink:label="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer credit terms (in days)</link:label>
    <link:label id="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C_label_en-US" xlink:label="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">customer credit terms days</link:label>
    <link:label id="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C_documentation_en-US" xlink:label="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">customer credit terms days</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_CustomerCreditTermsDays" xlink:label="loc_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:to="lab_htld_CustomerCreditTermsDays_92FC35BB77FAF29C1D97049EB42D541C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts Receivable, Current</link:label>
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts Receivable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4" xlink:to="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_B39D2AFAFA6DA61DEB59049EB42D01B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table]</link:label>
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C_label_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C" xlink:to="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTable_99F9F8C66FC696F83E37D8450B4BF15C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6_terseLabel_en-US" xlink:label="lab_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nature of Uncertainty [Axis]</link:label>
    <link:label id="lab_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6_label_en-US" xlink:label="lab_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nature of Uncertainty [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis" xlink:label="loc_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6" xlink:to="lab_us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis_B6D0E13CDE2824E73739D8450B4BD8A6" xlink:type="arc" />
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain]</link:label>
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF_label_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Nature of Uncertainty [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF" xlink:to="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleNatureOfUncertaintyDomain_8DA7BBA5324173EB17A7D8450B4B63BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B_terseLabel_en-US" xlink:label="lab_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:label id="lab_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B_label_en-US" xlink:label="lab_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B" xlink:to="lab_us-gaap_RangeAxis_9F594CBAB7CE317D2E19D8450B4BA86B" xlink:type="arc" />
    <link:label id="lab_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E_terseLabel_en-US" xlink:label="lab_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:label id="lab_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E_label_en-US" xlink:label="lab_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E" xlink:to="lab_us-gaap_RangeMember_689D4A764C859721AAA0D8450B4BFE2E" xlink:type="arc" />
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]</link:label>
    <link:label id="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED_label_en-US" xlink:label="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems" xlink:label="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED" xlink:to="lab_us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleLineItems_A736F4C3DA8569820FCED8450B4B86ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount</link:label>
    <link:label id="lab_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F" xlink:to="lab_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_1DA58AA8328C44DA6030D8450B4BD56F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Deferred Tax Assets and Liabilities [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Deferred Tax Assets and Liabilities [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907" xlink:to="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6FB32E52899406D91F07D8450B4B9907" xlink:type="arc" />
    <link:label id="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2_terseLabel_en-US" xlink:label="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Deferred Tax Assets (Liabilities) by Balance Sheet Classification [Table Text Block]</link:label>
    <link:label id="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2_label_en-US" xlink:label="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Deferred Tax Assets (Liabilities) by Balance Sheet Classification [Table Text Block]</link:label>
    <link:label id="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2_documentation_en-US" xlink:label="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Summary of Deferred Tax Assets (Liabilities) by Balance Sheet Classification [Table Text Block]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock" xlink:label="loc_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:to="lab_htld_SummaryOfDeferredTaxAssetsLiabilitiesByBalanceSheetClassificationTableTextBlock_D5E41E02F038DB054AFED8450B4B9FB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C" xlink:to="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_5E214C16635CCD8F9487D8450B4B844C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37" xlink:to="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_3E9795AB51F9C570E0E6D8450B4B7D37" xlink:type="arc" />
    <link:label id="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8_terseLabel_en-US" xlink:label="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Unrecognized Tax Benefits [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8_label_en-US" xlink:label="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock" xlink:label="loc_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8" xlink:to="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_26EFE1FE5D4D31D2529AD8450B4BAEC8" xlink:type="arc" />
    <link:label id="lab_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:label id="lab_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846_label_en-US" xlink:label="lab_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846" xlink:to="lab_us-gaap_NatureOfOperations_4B7DE9D2519E2EEE0443D07755002846" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_051F31D222384E1ED0D8D0775500C0E6" xlink:type="arc" />
    <link:label id="lab_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35" xlink:to="lab_us-gaap_UseOfEstimates_DBBAA6B84AA9633D14C1D07755005C35" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE_label_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE" xlink:to="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_ECFC8B6C2EB6DEEB3292D0775500BBCE" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71" xlink:to="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_126F30AAC5D026973494D07755005D71" xlink:type="arc" />
    <link:label id="lab_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable Securities, Held-to-maturity Securities, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities, Held-to-maturity Securities, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy" xlink:label="loc_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4" xlink:to="lab_us-gaap_MarketableSecuritiesHeldToMaturitySecuritiesPolicy_3E0784D2421FD83D491BD077550020D4" xlink:type="arc" />
    <link:label id="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954_terseLabel_en-US" xlink:label="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade and Other Accounts Receivable, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954_label_en-US" xlink:label="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trade and Other Accounts Receivable, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954" xlink:to="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_18D0D33399A11A5394ECD07755000954" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495_terseLabel_en-US" xlink:label="lab_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory Supplies, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495_label_en-US" xlink:label="lab_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory Supplies, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InventorySuppliesPolicy" xlink:label="loc_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495" xlink:to="lab_us-gaap_InventorySuppliesPolicy_3159F86572E435BAA251D0775500B495" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F8F1CB0790F2C42ED669D077550012A5" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Impairment [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Impairment [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentImpairment" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentImpairment_02D5C7210253F5B78FE3D0775500E0C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E" xlink:to="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_0FAA82B7DAA7D1720849D07755004B7E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A_terseLabel_en-US" xlink:label="lab_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A_label_en-US" xlink:label="lab_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost" xlink:label="loc_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A" xlink:to="lab_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_6F15E5A8D2AA4FAA40CCD0775500083A" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E" xlink:to="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_50176CED0A67C4DEB6AAD0775500825E" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets, Finite-Lived, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Finite-Lived, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IntangibleAssetsFiniteLivedPolicy" xlink:label="loc_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A" xlink:to="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_082055821B7783B9A3A4D0775500329A" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommitmentsAndContingenciesPolicyTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307" xlink:to="lab_us-gaap_CommitmentsAndContingenciesPolicyTextBlock_228AA53A3C450D4DEE5CD0775500F307" xlink:type="arc" />
    <link:label id="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A_terseLabel_en-US" xlink:label="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Self-insurance Policy Text Block [Policy Text Block]</link:label>
    <link:label id="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A_label_en-US" xlink:label="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Self-insurance Policy Text Block [Policy Text Block]</link:label>
    <link:label id="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A_documentation_en-US" xlink:label="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Discription of accounting policy for self insurance reserves associated with auto liability, cargo loss, associated loss adjustment expense, workers compensation and health insurance.</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_SelfInsurancePolicyTextBlockPolicyTextBlock" xlink:label="loc_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:to="lab_htld_SelfInsurancePolicyTextBlockPolicyTextBlock_37096DA02842193514C0D07755007C6A" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64" xlink:to="lab_us-gaap_RevenueRecognitionPolicyTextBlock_14C650509F54F44B3307D07755009B64" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of Sales, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54_label_en-US" xlink:label="lab_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Sales, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfSalesPolicyTextBlock" xlink:label="loc_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54" xlink:to="lab_us-gaap_CostOfSalesPolicyTextBlock_AA034A7B2520839476D9D07755000A54" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:label="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187" xlink:to="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_34B262E014CBDBAAA0A8D0775500C187" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5_label_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5" xlink:to="lab_us-gaap_EarningsPerSharePolicyTextBlock_15B7D75D968C3179C1A1D07755000AE5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596" xlink:to="lab_us-gaap_IncomeTaxPolicyTextBlock_A8B856A973FB45AAEDA5D0775500A596" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Uncertainties, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63_label_en-US" xlink:label="lab_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Uncertainties, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxUncertaintiesPolicy" xlink:label="loc_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63" xlink:to="lab_us-gaap_IncomeTaxUncertaintiesPolicy_49A3E33E520997E7B53DD07755000D63" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomePolicyPolicyTextBlock" xlink:label="loc_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B" xlink:to="lab_us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_81D5C8D1782F755E8E53D0775500AD7B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_AF0CA150F323901A1E75D0775500B478" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_7D10DDC020FB0BED840A049EB49AF8B2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C891B2A385229CA517ED049EB49A299B" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61_terseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset Impairment Charges</link:label>
    <link:label id="lab_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61_label_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61" xlink:to="lab_us-gaap_AssetImpairmentCharges_A46B490B3866B485B143049EB43D7D61" xlink:type="arc" />
    <link:label id="lab_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7_label_en-US" xlink:label="lab_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes [Abstract]</link:label>
    <link:label id="lab_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7_documentation_en-US" xlink:label="lab_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Income Taxes [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_IncomeTaxesAbstract" xlink:label="loc_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7" xlink:to="lab_htld_IncomeTaxesAbstract_22075C7AAFDB16CE3AFCE286D3061AD7" xlink:type="arc" />
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F_terseLabel_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent</link:label>
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F_label_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F" xlink:to="lab_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_12F2F320E89EF1CBDFB8E286D40FFA2F" xlink:type="arc" />
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30_terseLabel_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Percent</link:label>
    <link:label id="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30_label_en-US" xlink:label="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30" xlink:to="lab_us-gaap_EffectiveIncomeTaxRateContinuingOperations_A8E5F67FE55A8D7EBA1DE286D3068E30" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Tax Reconciliation, Other Adjustments</link:label>
    <link:label id="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effective Income Tax Rate Reconciliation, Other Adjustments, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627" xlink:to="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_C01C70836684BA43841FE286D306C627" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_6840C0AC65162F2E15E4E286D306C3D7" xlink:type="arc" />
    <link:label id="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6_terseLabel_en-US" xlink:label="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained</link:label>
    <link:label id="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6_label_en-US" xlink:label="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained</link:label>
    <link:label id="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6_documentation_en-US" xlink:label="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained" xlink:label="loc_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:to="lab_htld_Portionoftaxbenefitrecordedpositionsmorelikelythannottobesustained_DB6A3E49F5357F9A3744E286D306AFE6" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxUncertaintiesAbstract_12C97C1514C076DF9A66E286D306ECA1_label_en-US" xlink:label="lab_us-gaap_IncomeTaxUncertaintiesAbstract_12C97C1514C076DF9A66E286D306ECA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Uncertainties [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxUncertaintiesAbstract" xlink:label="loc_us-gaap_IncomeTaxUncertaintiesAbstract_12C97C1514C076DF9A66E286D306ECA1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxUncertaintiesAbstract_12C97C1514C076DF9A66E286D306ECA1" xlink:to="lab_us-gaap_IncomeTaxUncertaintiesAbstract_12C97C1514C076DF9A66E286D306ECA1" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits that Would Impact Effective Tax Rate</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits that Would Impact Effective Tax Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_869FA23F5B07DB880D6EE286D30690B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Period Increase (Decrease)</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Period Increase (Decrease)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease_74A01E048229B419FDAAE286D3065F8C" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_B70B712E87A33647AFACE286D3067146" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_6F514C98F3DE4AE99933E286D3063501" xlink:type="arc" />
    <link:label id="lab_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound</link:label>
    <link:label id="lab_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561_label_en-US" xlink:label="lab_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Decrease in Unrecognized Tax Benefits is Reasonably Possible</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561" xlink:to="lab_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_A851F3E4E8E72173FF45E286D3062561" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound</link:label>
    <link:label id="lab_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72_label_en-US" xlink:label="lab_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase in Unrecognized Tax Benefits is Reasonably Possible</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible" xlink:label="loc_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72" xlink:to="lab_us-gaap_IncreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_98A6BB6E0BF68AB2574EE286D306FC72" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_5DEC37E3C61C07F4FABAE286D3069ABF_label_en-US" xlink:label="lab_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_5DEC37E3C61C07F4FABAE286D3069ABF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward" xlink:label="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_5DEC37E3C61C07F4FABAE286D3069ABF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_5DEC37E3C61C07F4FABAE286D3069ABF" xlink:to="lab_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_5DEC37E3C61C07F4FABAE286D3069ABF" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878_periodStartLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance beginning of period</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878" xlink:to="lab_us-gaap_UnrecognizedTaxBenefits_3BBF37ACE220546DCC12E286D3061878" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions based on tax positions related to current year</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_5DFE57A347200ABA6FF5E286D30674AE" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0_terseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions for tax positions of prior years</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_F2715D199BE1AE456B87E286D306A6E0" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reductions for tax positions of prior years</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_3A7120CEBDF8500C70AFE286D30692E7" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Reductions due to lapse of applicable statute of limitations</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_451ECF9576F45DFF075AE286D3062723" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Settlements</link:label>
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB_label_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB" xlink:to="lab_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_1EE90D5E979A4910ABE7E286D30688DB" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecognizedTaxBenefits_767D207CEAEA9D944988E286D3063B3C_periodEndLabel_en-US" xlink:label="lab_us-gaap_UnrecognizedTaxBenefits_767D207CEAEA9D944988E286D3063B3C" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance end of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_767D207CEAEA9D944988E286D3063B3C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnrecognizedTaxBenefits_767D207CEAEA9D944988E286D3063B3C" xlink:to="lab_us-gaap_UnrecognizedTaxBenefits_767D207CEAEA9D944988E286D3063B3C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ValuationAllowanceAbstract_317189A52BB21538CA73E286D306B295_label_en-US" xlink:label="lab_us-gaap_ValuationAllowanceAbstract_317189A52BB21538CA73E286D306B295" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Valuation Allowance [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowanceAbstract" xlink:label="loc_us-gaap_ValuationAllowanceAbstract_317189A52BB21538CA73E286D306B295" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ValuationAllowanceAbstract_317189A52BB21538CA73E286D306B295" xlink:to="lab_us-gaap_ValuationAllowanceAbstract_317189A52BB21538CA73E286D306B295" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Valuation Allowance, Amount</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Valuation Allowance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E" xlink:to="lab_us-gaap_DeferredTaxAssetsValuationAllowance_7389C3D96F479DDDEC5AE286D306F13E" xlink:type="arc" />
    <link:label id="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF_terseLabel_en-US" xlink:label="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred TaxLiability, Provisional Income Tax (Expense) Benefit</link:label>
    <link:label id="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF_label_en-US" xlink:label="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred TaxLiability, Provisional Income Tax (Expense) Benefit</link:label>
    <link:label id="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF_documentation_en-US" xlink:label="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred TaxLiability, Provisional Income Tax (Expense) Benefit</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit" xlink:label="loc_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:to="lab_htld_TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit_630BFC589CBFCC9604B6E286D3064FDF" xlink:type="arc" />
    <link:label id="lab_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60_label_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Repurchases [Abstract]</link:label>
    <link:label id="lab_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60_documentation_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Note 10.  Share Repurchases [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_ShareRepurchasesAbstract" xlink:label="loc_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60" xlink:to="lab_htld_ShareRepurchasesAbstract_B55F1340ED4703CDC9CF049EB44CDB60" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders' Equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF" xlink:to="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_0E3656157B8703F5A431049EB44C30CF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based Compensation</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9" xlink:to="lab_us-gaap_ShareBasedCompensation_D3FB1583A2BF2D24E8C5049EB43DC0C9" xlink:type="arc" />
    <link:label id="lab_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0_label_en-US" xlink:label="lab_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Abstract]</link:label>
    <link:label id="lab_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0_documentation_en-US" xlink:label="lab_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_RelatedPartyAbstract" xlink:label="loc_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0" xlink:to="lab_htld_RelatedPartyAbstract_F9AA163B0C67F5C8571CE22A204BCAC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Related Party Transactions [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Related Party Transactions [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A" xlink:to="lab_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_55C7E31F1C1801B0810BE22A204BF22A" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_0EC20807DF78404652D7049EB4BA6713_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_0EC20807DF78404652D7049EB4BA6713" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_0EC20807DF78404652D7049EB4BA6713" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_0EC20807DF78404652D7049EB4BA6713" xlink:to="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_0EC20807DF78404652D7049EB4BA6713" xlink:type="arc" />
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets and Goodwill</link:label>
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C" xlink:to="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_CDCE7DDE1FEB0E530DA2049EB4BA2D7C" xlink:type="arc" />
    <link:label id="lab_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Reportable Segments</link:label>
    <link:label id="lab_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6_label_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Reportable Segments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6" xlink:to="lab_us-gaap_NumberOfReportableSegments_8122220BB4B44500C4BF049EB4AA6BA6" xlink:type="arc" />
    <link:label id="lab_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6_label_en-US" xlink:label="lab_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Profit Sharing Plan and Retirement Plan [Abstract]</link:label>
    <link:label id="lab_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6_documentation_en-US" xlink:label="lab_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Profit Sharing Plan and Retirement Plan [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_ProfitSharingPlanAndRetirementPlanAbstract" xlink:label="loc_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6" xlink:to="lab_htld_ProfitSharingPlanAndRetirementPlanAbstract_EF4673ED3F0A9AEB19EF049EB4C9FDB6" xlink:type="arc" />
    <link:label id="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8_terseLabel_en-US" xlink:label="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Profit Sharing Plan and Retirement Plan</link:label>
    <link:label id="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8_label_en-US" xlink:label="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Compensation and Employee Benefit Plans [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CompensationAndEmployeeBenefitPlansTextBlock" xlink:label="loc_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8" xlink:to="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_EE970795DDA4076D44BD049EB4C9CAA8" xlink:type="arc" />
    <link:label id="lab_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5_label_en-US" xlink:label="lab_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accident and Workers' Compensation Insurance Liabilities [Abstract]</link:label>
    <link:label id="lab_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5_documentation_en-US" xlink:label="lab_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accident and Workers' Compensation Insurance Liabilities [Abstract]</link:label>
    <link:loc xlink:href="htld-20171231.xsd#htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract" xlink:label="loc_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5" xlink:to="lab_htld_AccidentAndWorkersCompensationInsuranceLiabilitiesAbstract_09F1E8F4856E36B138F1049EB4AA4FC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accident and Workers' Compensation Insurance Liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesDisclosureTextBlock" xlink:label="loc_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180" xlink:to="lab_us-gaap_OtherLiabilitiesDisclosureTextBlock_D018CFF7117C2836EC23049EB4AAE180" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473_label_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473" xlink:to="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08DD4DC5EEC6C7F320BAE1F705CE6473" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70" xlink:to="lab_us-gaap_BusinessAcquisitionAxis_EE3AFC8D64AF57AC9096E1F705D0DF70" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB" xlink:to="lab_us-gaap_BusinessAcquisitionAcquireeDomain_E518D11DBB14D9BABBC6E1F705D003BB" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5_terseLabel_en-US" xlink:label="lab_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash [Member]</link:label>
    <link:label id="lab_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5_label_en-US" xlink:label="lab_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashMember" xlink:label="loc_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5" xlink:to="lab_us-gaap_CashMember_CC2E8339BED8C9080950E1F705D0FAC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B" xlink:to="lab_us-gaap_IncomeStatementLocationAxis_C7F5CB458B4A0C97856AE1F705D1644B" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F" xlink:to="lab_us-gaap_IncomeStatementLocationDomain_18F0ABB3039A6F190C17E1F705D1272F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880_terseLabel_en-US" xlink:label="lab_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:label id="lab_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880_label_en-US" xlink:label="lab_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Ownership [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OwnershipAxis" xlink:label="loc_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880" xlink:to="lab_us-gaap_OwnershipAxis_E84DFE3DED373084436DE1F705D10880" xlink:type="arc" />
    <link:label id="lab_us-gaap_OwnershipDomain_9A00A243BF7D0E5AE17CE1F705D1ABB5_terseLabel_en-US" xlink:label="lab_us-gaap_OwnershipDomain_9A00A243BF7D0E5AE17CE1F705D1ABB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership [Domain]</link:label>
    <link:label id="lab_us-gaap_OwnershipDomain_9A00A243BF7D0E5AE17CE1F705D1ABB5_label_en-US" xlink:label="lab_us-gaap_OwnershipDomain_9A00A243BF7D0E5AE17CE1F705D1ABB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type