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    <link:loc xlink:href="htld-20180331.xsd#htld_SegmentInformationTextBlock" xlink:label="loc_htld_SegmentInformationTextBlock_8B36CC40BAB481F8A9E57272624C297A" xlink:type="locator" />
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    <link:label id="lab_htld_ShareRepurchasesAbstract_BB396674DB64D186F48ED95B49CF1B2C_label_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_BB396674DB64D186F48ED95B49CF1B2C" 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_BB396674DB64D186F48ED95B49CF1B2C_documentation_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_BB396674DB64D186F48ED95B49CF1B2C" 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-20180331.xsd#htld_ShareRepurchasesAbstract" xlink:label="loc_htld_ShareRepurchasesAbstract_BB396674DB64D186F48ED95B49CF1B2C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_02EAEC0814ECDE84FBE8D95B49CFB8B3_terseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_02EAEC0814ECDE84FBE8D95B49CFB8B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Shares Authorized to be Repurchased</link:label>
    <link:label id="lab_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_02EAEC0814ECDE84FBE8D95B49CFB8B3_label_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_02EAEC0814ECDE84FBE8D95B49CFB8B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Repurchase Program, Number of Shares Authorized to be Repurchased</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased" xlink:label="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_02EAEC0814ECDE84FBE8D95B49CFB8B3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TreasuryStockSharesAcquired_E9E2F7EE943FE85B54D5D95B49CFE860_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockSharesAcquired_E9E2F7EE943FE85B54D5D95B49CFE860" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury Stock, Shares, Acquired</link:label>
    <link:label id="lab_us-gaap_TreasuryStockSharesAcquired_E9E2F7EE943FE85B54D5D95B49CFE860_label_en-US" xlink:label="lab_us-gaap_TreasuryStockSharesAcquired_E9E2F7EE943FE85B54D5D95B49CFE860" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Shares, Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_E9E2F7EE943FE85B54D5D95B49CFE860" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610_terseLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Dividends, Common Stock, Cash</link:label>
    <link:label id="lab_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610_label_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Dividends, Common Stock, Cash</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610" xlink:to="lab_us-gaap_DividendsCommonStockCash_4A65A4813D11AE8B5BFDD95B49CF0610" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeasesAbstract_ADD8504660228648C7EC47219AD72DA4_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_ADD8504660228648C7EC47219AD72DA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_ADD8504660228648C7EC47219AD72DA4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_ADD8504660228648C7EC47219AD72DA4" xlink:to="lab_us-gaap_LeasesAbstract_ADD8504660228648C7EC47219AD72DA4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9128ED6EC56FDF0F393147219AD77F39_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9128ED6EC56FDF0F393147219AD77F39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Operating Leased Assets [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9128ED6EC56FDF0F393147219AD77F39_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_9128ED6EC56FDF0F393147219AD77F39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Operating Leased Assets [Table]</link:label>
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Axis]</link:label>
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34" xlink:to="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_199D1AE0FE16B06A55ED47219AD87E34" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Domain]</link:label>
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Domain]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF" xlink:to="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_D83FA7D04E72AB6C1FC247219AD8C7DF" xlink:type="arc" />
    <link:label id="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C_terseLabel_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Terminal Facilities</link:label>
    <link:label id="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C_label_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Terminal Facilities [Member]</link:label>
    <link:label id="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C_documentation_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_B666D01201D1982C62CC47219AD8837C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Terminal Facilities [Member]</link:label>
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    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_AE66B66D24A8DA66350247219AD8366D_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_AE66B66D24A8DA66350247219AD8366D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parties to Contractual Arrangement [Axis]</link:label>
    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_AE66B66D24A8DA66350247219AD8366D_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_AE66B66D24A8DA66350247219AD8366D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_173E097D4061D072210347219AD814FB_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_173E097D4061D072210347219AD814FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parties to Contractual Arrangement [Domain]</link:label>
    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_173E097D4061D072210347219AD814FB_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_173E097D4061D072210347219AD814FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Domain]</link:label>
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    <link:label id="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B_terseLabel_en-US" xlink:label="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B_label_en-US" xlink:label="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
    <link:label id="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B_documentation_en-US" xlink:label="lab_htld_RelatedPartyMember_B637A82FB651AF2BD55E47219AD80A0B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_B9D414747726AE2F82D84701BD6949D2_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_B9D414747726AE2F82D84701BD6949D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A26C51C49086B2F012AA4701BD69D196_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A26C51C49086B2F012AA4701BD69D196" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">OPERATING ACTIVITIES</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A26C51C49086B2F012AA4701BD69D196_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_A26C51C49086B2F012AA4701BD69D196" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_A53B0CE8D58B76F1BC8E4701BD691A19_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_A53B0CE8D58B76F1BC8E4701BD691A19" 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_A53B0CE8D58B76F1BC8E4701BD691A19_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_A53B0CE8D58B76F1BC8E4701BD691A19" 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_A53B0CE8D58B76F1BC8E4701BD691A19" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F9E775F0A81FA0AA4F524701BD69D9FF_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F9E775F0A81FA0AA4F524701BD69D9FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net income to net cash provided by operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F9E775F0A81FA0AA4F524701BD69D9FF_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F9E775F0A81FA0AA4F524701BD69D9FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_F31B13BEE83A004448624701BD693FC4_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_F31B13BEE83A004448624701BD693FC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_F31B13BEE83A004448624701BD693FC4_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_F31B13BEE83A004448624701BD693FC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_F31B13BEE83A004448624701BD693FC4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_C468EE8EA63D780F43C64701BD697C4E_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_C468EE8EA63D780F43C64701BD697C4E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_C468EE8EA63D780F43C64701BD697C4E_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_C468EE8EA63D780F43C64701BD697C4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Deferred Income Taxes</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_C468EE8EA63D780F43C64701BD697C4E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_32119210EEC9BC2AB17F4701BD698ABC_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_32119210EEC9BC2AB17F4701BD698ABC" 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_AllocatedShareBasedCompensationExpense_32119210EEC9BC2AB17F4701BD698ABC_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_32119210EEC9BC2AB17F4701BD698ABC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_32119210EEC9BC2AB17F4701BD698ABC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_23B855CD2F5083C691E84701BD69F2F9_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_23B855CD2F5083C691E84701BD69F2F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of stock-based compensation, net of tax</link:label>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_23B855CD2F5083C691E84701BD69F2F9_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_23B855CD2F5083C691E84701BD69F2F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_23B855CD2F5083C691E84701BD69F2F9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Gain on disposal of property and equipment</link:label>
    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8" xlink:to="lab_us-gaap_GainLossOnDispositionOfAssets_6425CBFDBB2D951A44F94701BD69AFC8" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_05726834322BE7956B5C4701BD69D563_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_05726834322BE7956B5C4701BD69D563" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in certain working capital items:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_05726834322BE7956B5C4701BD69D563_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_05726834322BE7956B5C4701BD69D563" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_05726834322BE7956B5C4701BD69D563" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_54E889E6C099BC20808A4701BD69B0D3_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_54E889E6C099BC20808A4701BD69B0D3" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Trade receivables</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_54E889E6C099BC20808A4701BD69B0D3_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_54E889E6C099BC20808A4701BD69B0D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Receivables</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_54E889E6C099BC20808A4701BD69B0D3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8C4342E2C5F7AF001ECE4701BD696889_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8C4342E2C5F7AF001ECE4701BD696889" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8C4342E2C5F7AF001ECE4701BD696889_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8C4342E2C5F7AF001ECE4701BD696889" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable, accrued liabilities, and accrued expenses</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable and Accrued Liabilities</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_31B449D1AA646E88052A4701BD69C4E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B6D841F08787DFD2B96F4701BD69D05B_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B6D841F08787DFD2B96F4701BD69D05B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued income taxes</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B6D841F08787DFD2B96F4701BD69D05B_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_B6D841F08787DFD2B96F4701BD69D05B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Income Taxes Payable</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD1FC7BBEEF7ED8F692D4701BD696D37_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD1FC7BBEEF7ED8F692D4701BD696D37" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD1FC7BBEEF7ED8F692D4701BD696D37_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_BD1FC7BBEEF7ED8F692D4701BD696D37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">INVESTING ACTIVITIES</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_6F6E84BB6135A19C60B34701BD69C12D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of property and equipment</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Property, Plant, and Equipment</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F" xlink:to="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_DFC706D9B42B4BF2ED514701BD69EB2F" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of property and equipment, net of trades</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_243F60EE0DC66128A9C14701BD6994CE" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in designated funds for equipment purchases</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Delayed Tax Exempt Exchange</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange" xlink:label="loc_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1" xlink:to="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_A6281E9F0AACAE0F467D4701BD69C2F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_105D170E32ADA484ADED4701BD694408_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_105D170E32ADA484ADED4701BD694408" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in designated funds for claims acquired</link:label>
    <link:label id="lab_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_105D170E32ADA484ADED4701BD694408_label_en-US" xlink:label="lab_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_105D170E32ADA484ADED4701BD694408" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForLossesAndLossAdjustmentExpense" xlink:label="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_105D170E32ADA484ADED4701BD694408" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FE1A743C585F31CB8D014701BD69F0D0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FE1A743C585F31CB8D014701BD69F0D0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Acquisition of business, net of cash acquired</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FE1A743C585F31CB8D014701BD69F0D0_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FE1A743C585F31CB8D014701BD69F0D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Businesses, Net of Cash Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_FE1A743C585F31CB8D014701BD69F0D0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in other assets</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Other Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829" xlink:to="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_86F314E7236E4D9A220D4701BD69A829" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash (used in) provided by investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_74F5906CB6E5AA8C68F64701BD691E25" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_861CD6E6EC035D90AE5D4701BD690E47_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_861CD6E6EC035D90AE5D4701BD690E47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">FINANCING ACTIVITIES</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_861CD6E6EC035D90AE5D4701BD690E47_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_861CD6E6EC035D90AE5D4701BD690E47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_861CD6E6EC035D90AE5D4701BD690E47" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_2776D5A0C5A9B4DE457E4701BD69270B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_2776D5A0C5A9B4DE457E4701BD69270B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments of cash dividends</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_2776D5A0C5A9B4DE457E4701BD69270B_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_2776D5A0C5A9B4DE457E4701BD69270B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Ordinary Dividends, Common Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_2776D5A0C5A9B4DE457E4701BD69270B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7C67331CE3E3E5525D274701BD691CB3_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7C67331CE3E3E5525D274701BD691CB3" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Shares withheld for employee taxes related to stock-based compensation</link:label>
    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7C67331CE3E3E5525D274701BD691CB3_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7C67331CE3E3E5525D274701BD691CB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments Related to Tax Withholding for 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_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_7C67331CE3E3E5525D274701BD691CB3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9D95F8A23788ED66545F4701BD69C158_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9D95F8A23788ED66545F4701BD69C158" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Shares Paid for Tax Withholding for Share Based Compensation</link:label>
    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9D95F8A23788ED66545F4701BD69C158_label_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9D95F8A23788ED66545F4701BD69C158" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Shares Paid for Tax Withholding for 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_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9D95F8A23788ED66545F4701BD69C158" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_C571CFB1E5826637FF8D4701BD695AE8_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_C571CFB1E5826637FF8D4701BD695AE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contingent consideration related to acquisition</link:label>
    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_C571CFB1E5826637FF8D4701BD695AE8_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_C571CFB1E5826637FF8D4701BD695AE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability</link:label>
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_F4E7EACD4C92F8EEA89A4701BD690757_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_F4E7EACD4C92F8EEA89A4701BD690757" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repurchases of common stock</link:label>
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    <link:label id="lab_us-gaap_RepaymentsOfOtherDebt_587F4CAEB5F4EC3CA6724701BD699F1F_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfOtherDebt_587F4CAEB5F4EC3CA6724701BD699F1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Other Debt</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_C8F8DE9813A9EB7CE4D04701BD69B9AA_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_C8F8DE9813A9EB7CE4D04701BD69B9AA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_C8F8DE9813A9EB7CE4D04701BD69B9AA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_C8F8DE9813A9EB7CE4D04701BD69B9AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_46E0553B34E18779FBBE4701BD69FD9B_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_46E0553B34E18779FBBE4701BD69FD9B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase in cash, cash equivalents and restricted cash</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_46E0553B34E18779FBBE4701BD69FD9B_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_46E0553B34E18779FBBE4701BD69FD9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Period Increase (Decrease)</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract_B8DB24A14481A36CC8C14701BD690CBF_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract_B8DB24A14481A36CC8C14701BD690CBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH, CASH EQUIVALENTS AND RESTRICTED CASH</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract_B8DB24A14481A36CC8C14701BD690CBF_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseAbstract_B8DB24A14481A36CC8C14701BD690CBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_F15E15DC2BE2CDF4EE534701BD692338_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_F15E15DC2BE2CDF4EE534701BD692338" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5D1972928F47898B57854701BD69351F_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5D1972928F47898B57854701BD69351F" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">End of period</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5D1972928F47898B57854701BD69351F" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_5D1972928F47898B57854701BD69351F" xlink:type="arc" />
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_22D52C6DCBC9421043144701BD69B83D_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_22D52C6DCBC9421043144701BD69B83D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION</link:label>
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_22D52C6DCBC9421043144701BD69B83D_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_22D52C6DCBC9421043144701BD69B83D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_22D52C6DCBC9421043144701BD69B83D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestPaid_2FC19ADB7997172ABEF94701BD6989A2_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaid_2FC19ADB7997172ABEF94701BD6989A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_us-gaap_InterestPaid_2FC19ADB7997172ABEF94701BD6989A2_label_en-US" xlink:label="lab_us-gaap_InterestPaid_2FC19ADB7997172ABEF94701BD6989A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_18D3727CD4A0196201194701BD6961CC_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_18D3727CD4A0196201194701BD6961CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid (received) during the period for income taxes, net of refunds</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_18D3727CD4A0196201194701BD6961CC_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_18D3727CD4A0196201194701BD6961CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_F008EB50917E71BDF2FD4701BD698273_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_F008EB50917E71BDF2FD4701BD698273" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Noncash investing and financing activities:</link:label>
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    <link:label id="lab_htld_TreasuryStockAcquiredInAccountsPayable_1853B685829F67790A804701BD69F13E_terseLabel_en-US" xlink:label="lab_htld_TreasuryStockAcquiredInAccountsPayable_1853B685829F67790A804701BD69F13E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Treasury stock acquired in accounts payable</link:label>
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    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsAbstract_A3F148D7D46CE4902E764701BD69ECCA_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsAbstract_A3F148D7D46CE4902E764701BD69ECCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalents [Abstract]</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_8DFDEA59633F80F8FA404701BD6910D5_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_8DFDEA59633F80F8FA404701BD6910D5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_8DFDEA59633F80F8FA404701BD6910D5_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_8DFDEA59633F80F8FA404701BD6910D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
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    <link:label id="lab_us-gaap_RestrictedCashAndInvestmentsCurrent_86C79B6097290E38E8354701BD69A58A_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndInvestmentsCurrent_86C79B6097290E38E8354701BD69A58A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash and Investments, Current</link:label>
    <link:label id="lab_us-gaap_RestrictedCashAndInvestmentsCurrent_86C79B6097290E38E8354701BD69A58A_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndInvestmentsCurrent_86C79B6097290E38E8354701BD69A58A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Investments, Current</link:label>
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    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_B21920C992ACB4E8D0554701BD696EC6_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_B21920C992ACB4E8D0554701BD696EC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalents, Noncurrent</link:label>
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_B21920C992ACB4E8D0554701BD696EC6_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_B21920C992ACB4E8D0554701BD696EC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Cash and Cash Equivalents, Noncurrent</link:label>
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    <link:label id="lab_htld_BasisofPresentationAbstract_51DC6D518D9A3E091AD445261BECB9F4_label_en-US" xlink:label="lab_htld_BasisofPresentationAbstract_51DC6D518D9A3E091AD445261BECB9F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Presentation [Abstract]</link:label>
    <link:label id="lab_htld_BasisofPresentationAbstract_51DC6D518D9A3E091AD445261BECB9F4_documentation_en-US" xlink:label="lab_htld_BasisofPresentationAbstract_51DC6D518D9A3E091AD445261BECB9F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Basis of Presentation [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_63E6FBEA2DFE7D7D60F745261BECAD94_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_63E6FBEA2DFE7D7D60F745261BECAD94" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_63E6FBEA2DFE7D7D60F745261BECAD94_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_63E6FBEA2DFE7D7D60F745261BECAD94" 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_63E6FBEA2DFE7D7D60F745261BECAD94" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D0FD3D2BF036CAA29B8A45261BECE7F8_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D0FD3D2BF036CAA29B8A45261BECE7F8" 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_D0FD3D2BF036CAA29B8A45261BECE7F8_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D0FD3D2BF036CAA29B8A45261BECE7F8" 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_D0FD3D2BF036CAA29B8A45261BECE7F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D0FD3D2BF036CAA29B8A45261BECE7F8" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_D0FD3D2BF036CAA29B8A45261BECE7F8" xlink:type="arc" />
    <link:label id="lab_us-gaap_UseOfEstimates_B59445BF5A4D16A6C9F145261BECC795_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_B59445BF5A4D16A6C9F145261BECC795" 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_B59445BF5A4D16A6C9F145261BECC795_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_B59445BF5A4D16A6C9F145261BECC795" 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>
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    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_FDF66689FDB2D4E7074E45261BEC9DFE_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_FDF66689FDB2D4E7074E45261BEC9DFE" 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_FDF66689FDB2D4E7074E45261BEC9DFE_label_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_FDF66689FDB2D4E7074E45261BEC9DFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_88DEA4D2E06B92492AA345261BECE920_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_88DEA4D2E06B92492AA345261BECE920" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_9BFD823976855A4D5F1E414B10EDB0CA_terseLabel_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_9BFD823976855A4D5F1E414B10EDB0CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid tires</link:label>
    <link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_9BFD823976855A4D5F1E414B10EDB0CA_label_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_9BFD823976855A4D5F1E414B10EDB0CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Prepaid Expense, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_9BFD823976855A4D5F1E414B10EDB0CA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherAssetsCurrent_C0E8F35D164A9D0621A5414B10EDF8A9_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_C0E8F35D164A9D0621A5414B10EDF8A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_C0E8F35D164A9D0621A5414B10EDF8A9_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_C0E8F35D164A9D0621A5414B10EDF8A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesReceivable_85317EFF851213E8CD32414B10ED337A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_85317EFF851213E8CD32414B10ED337A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income tax receivable</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesReceivable_85317EFF851213E8CD32414B10ED337A_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_85317EFF851213E8CD32414B10ED337A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Receivable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_85317EFF851213E8CD32414B10ED337A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_F5E106A0EFD4E29FC96A414B10ED7CF6_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_F5E106A0EFD4E29FC96A414B10ED7CF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes, net</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_F5E106A0EFD4E29FC96A414B10ED7CF6_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_F5E106A0EFD4E29FC96A414B10ED7CF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Net of Valuation Allowance, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_F5E106A0EFD4E29FC96A414B10ED7CF6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrent_2AE37E7DD97CF484E5C5414B10ED1C42_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_2AE37E7DD97CF484E5C5414B10ED1C42" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_2AE37E7DD97CF484E5C5414B10ED1C42_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_2AE37E7DD97CF484E5C5414B10ED1C42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_2AE37E7DD97CF484E5C5414B10ED1C42" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_FF300DD6D02B5390432A414B10ED74BE_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_FF300DD6D02B5390432A414B10ED74BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_FF300DD6D02B5390432A414B10ED74BE_label_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_FF300DD6D02B5390432A414B10ED74BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_9C7BE80F0E356D51A74E414B10ED37D9_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_9C7BE80F0E356D51A74E414B10ED37D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PROPERTY AND EQUIPMENT</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_9C7BE80F0E356D51A74E414B10ED37D9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_9C7BE80F0E356D51A74E414B10ED37D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LandAndLandImprovements_DDB5E5F65506BA674D2B414B10ED082B_terseLabel_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_DDB5E5F65506BA674D2B414B10ED082B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land and land improvements</link:label>
    <link:label id="lab_us-gaap_LandAndLandImprovements_DDB5E5F65506BA674D2B414B10ED082B_label_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_DDB5E5F65506BA674D2B414B10ED082B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land and Land Improvements</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LandAndLandImprovements" xlink:label="loc_us-gaap_LandAndLandImprovements_DDB5E5F65506BA674D2B414B10ED082B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_A396A3FAD8939E92480D414B10EDA582_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_A396A3FAD8939E92480D414B10EDA582" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Buildings</link:label>
    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_A396A3FAD8939E92480D414B10EDA582_label_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_A396A3FAD8939E92480D414B10EDA582" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Buildings and Improvements, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_A396A3FAD8939E92480D414B10EDA582" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_DB23EDDED4AFC1E3CB8D414B10EDBA1A_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_DB23EDDED4AFC1E3CB8D414B10EDBA1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leasehold improvements</link:label>
    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_DB23EDDED4AFC1E3CB8D414B10EDBA1A_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_DB23EDDED4AFC1E3CB8D414B10EDBA1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leasehold Improvements, Gross</link:label>
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    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_4D5FBF117A4774424E3B414B10ED3749_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_4D5FBF117A4774424E3B414B10ED3749" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Furniture and fixtures</link:label>
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_4D5FBF117A4774424E3B414B10ED3749_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_4D5FBF117A4774424E3B414B10ED3749" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Furniture and Fixtures, Gross</link:label>
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    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_E86F466B820A95EE8595414B10EDB231_terseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_E86F466B820A95EE8595414B10EDB231" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shop and service equipment</link:label>
    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_E86F466B820A95EE8595414B10EDB231_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_E86F466B820A95EE8595414B10EDB231" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Machinery and Equipment, Gross</link:label>
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    <link:label id="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872_terseLabel_en-US" xlink:label="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue equipment</link:label>
    <link:label id="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872_label_en-US" xlink:label="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">REVENUE EQUIPMENT</link:label>
    <link:label id="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872_documentation_en-US" xlink:label="lab_htld_RevenueEquipment_3321A6DD18C90020BE5C414B10EDC872" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying amount at the balance sheet date for long lived physical assets used in the normal conduct of business and not intended for resale.  Revenue equipment includes tractors and trailers used for purposes of providing transportation services.</link:label>
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    <link:label id="lab_us-gaap_ConstructionInProgressGross_2DE0A1A2B4BCB2B5FD2A414B10ED81DD_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_2DE0A1A2B4BCB2B5FD2A414B10ED81DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in progress</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8E3023750BA54AC139AD414B10FD311B_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_8E3023750BA54AC139AD414B10FD311B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_10A2DCDD088339B6EE1D414B10FD17A0_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_10A2DCDD088339B6EE1D414B10FD17A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CURRENT LIABILITIES</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_10A2DCDD088339B6EE1D414B10FD17A0_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_10A2DCDD088339B6EE1D414B10FD17A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_E10164AEE9C8ADBE846D414B10FD49D5_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_E10164AEE9C8ADBE846D414B10FD49D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Current</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesNoncurrentAbstract_08AA191A3C6E0D1A2AB6414B10FD8FF2_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrentAbstract_08AA191A3C6E0D1A2AB6414B10FD8FF2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LONG-TERM LIABILITIES</link:label>
    <link:label id="lab_us-gaap_LiabilitiesNoncurrentAbstract_08AA191A3C6E0D1A2AB6414B10FD8FF2_label_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrentAbstract_08AA191A3C6E0D1A2AB6414B10FD8FF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Noncurrent [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AccruedIncomeTaxesNoncurrent_87DE5E106A9091A5D472414B10FDF6FF_label_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesNoncurrent_87DE5E106A9091A5D472414B10FDF6FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Income Taxes, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_017EC694E6EE27C1C916414B10FDD3B6_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_017EC694E6EE27C1C916414B10FDD3B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Net, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_SelfInsuranceReserveNoncurrent_BD7D96731574FBBFB26C414B10FDB26B_terseLabel_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveNoncurrent_BD7D96731574FBBFB26C414B10FDB26B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance accruals less current portion</link:label>
    <link:label id="lab_us-gaap_SelfInsuranceReserveNoncurrent_BD7D96731574FBBFB26C414B10FDB26B_label_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveNoncurrent_BD7D96731574FBBFB26C414B10FDB26B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Self Insurance Reserve, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_A1C8C958D3C12A83D4DD414B10FDF477_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_A1C8C958D3C12A83D4DD414B10FDF477" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other long-term liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_A1C8C958D3C12A83D4DD414B10FDF477_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_A1C8C958D3C12A83D4DD414B10FDF477" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesNoncurrent_AE8F634F4A9115ACA7F0414B10FDC360_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrent_AE8F634F4A9115ACA7F0414B10FDC360" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total long-term liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesNoncurrent_AE8F634F4A9115ACA7F0414B10FDC360_label_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrent_AE8F634F4A9115ACA7F0414B10FDC360" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_StockholdersEquityAbstract_31B584C8F8B3B1735FD2414B10FD6BD3_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_31B584C8F8B3B1735FD2414B10FD6BD3" 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_StockholdersEquityAbstract_31B584C8F8B3B1735FD2414B10FD6BD3_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_31B584C8F8B3B1735FD2414B10FD6BD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent [Abstract]</link:label>
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    <link:label id="lab_us-gaap_PreferredStockValue_D1065824EFD98B3661E5414B10FD90D1_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockValue_D1065824EFD98B3661E5414B10FD90D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Preferred stock, par value $.01; authorized 5,000 shares; none issued</link:label>
    <link:label id="lab_us-gaap_PreferredStockValue_D1065824EFD98B3661E5414B10FD90D1_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_D1065824EFD98B3661E5414B10FD90D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Value, Issued</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E3619E7637B0BDEF216DBA92BF0072C1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142" xlink:to="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_12863AFFE8EFD1F2C5ABBA92BF008142" xlink:type="arc" />
    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C_terseLabel_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant, Leverage Ratio</link:label>
    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C_label_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant, Leverage Ratio</link:label>
    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C_documentation_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant, Leverage Ratio</link:label>
    <link:loc xlink:href="htld-20180331.xsd#htld_DebtInstrumentCovenantLeverageRatio" xlink:label="loc_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:to="lab_htld_DebtInstrumentCovenantLeverageRatio_0EF93160AC20CF0451C6BA92BF00923C" xlink:type="arc" />
    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
    <link:loc xlink:href="htld-20180331.xsd#htld_DebtCovenantMinimumNetIncomeRequirement" xlink:label="loc_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:to="lab_htld_DebtCovenantMinimumNetIncomeRequirement_AD0ACDB3DB0A9BBC7D72BA92BF00CF31" xlink:type="arc" />
    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Tangible Net Worth</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Tangible Net Worth</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Tangible Net Worth</link:label>
    <link:loc xlink:href="htld-20180331.xsd#htld_DebtCovenantMinimumTangibleNetWorth" xlink:label="loc_htld_DebtCovenantMinimumTangibleNetWorth_EB91686D35EC8F44C64CBA92BF00CAE2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B" xlink:to="lab_us-gaap_LongTermDebt_C95A90664CA23FAE7692BA9B6716148B" xlink:type="arc" />
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_C85C0C22E2DA415A677CBA92BF00DD96" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396" xlink:to="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_AE916F854B43E9B7D810BA92BF00D396" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerAbstract_6459830526C543EF8B2C42603523C7C6_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerAbstract_6459830526C543EF8B2C42603523C7C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6459830526C543EF8B2C42603523C7C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6459830526C543EF8B2C42603523C7C6" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerAbstract_6459830526C543EF8B2C42603523C7C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTable_5F829B570CD2B451F5B442603523C8F6_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_5F829B570CD2B451F5B442603523C8F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table]</link:label>
    <link:label id="lab_us-gaap_DisaggregationOfRevenueTable_5F829B570CD2B451F5B442603523C8F6_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_5F829B570CD2B451F5B442603523C8F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_5F829B570CD2B451F5B442603523C8F6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProductOrServiceAxis_C92DD4FB7A3CE89FB74042603523DB19_terseLabel_en-US" xlink:label="lab_us-gaap_ProductOrServiceAxis_C92DD4FB7A3CE89FB74042603523DB19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Products and Services [Axis]</link:label>
    <link:label id="lab_us-gaap_ProductOrServiceAxis_C92DD4FB7A3CE89FB74042603523DB19_label_en-US" xlink:label="lab_us-gaap_ProductOrServiceAxis_C92DD4FB7A3CE89FB74042603523DB19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Products and Services [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_C92DD4FB7A3CE89FB74042603523DB19" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProductsAndServicesDomain_9204DCA95065D3F45756426035232C5E_terseLabel_en-US" xlink:label="lab_us-gaap_ProductsAndServicesDomain_9204DCA95065D3F45756426035232C5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Products and Services [Domain]</link:label>
    <link:label id="lab_us-gaap_ProductsAndServicesDomain_9204DCA95065D3F45756426035232C5E_label_en-US" xlink:label="lab_us-gaap_ProductsAndServicesDomain_9204DCA95065D3F45756426035232C5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Products and Services [Domain]</link:label>
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    <link:label id="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6_terseLabel_en-US" xlink:label="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">fuel surcharge [Member]</link:label>
    <link:label id="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6_label_en-US" xlink:label="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">fuel surcharge [Member]</link:label>
    <link:label id="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6_documentation_en-US" xlink:label="lab_htld_FuelsurchargeMember_C15BA2EBC35566F825E84260352313B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fuel Surcharge [Member]</link:label>
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    <link:label id="lab_us-gaap_StatementGeographicalAxis_D62F0896B33124E91CC2426035234EA5_terseLabel_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_D62F0896B33124E91CC2426035234EA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementGeographicalAxis_D62F0896B33124E91CC2426035234EA5_label_en-US" xlink:label="lab_us-gaap_StatementGeographicalAxis_D62F0896B33124E91CC2426035234EA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Axis]</link:label>
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    <link:label id="lab_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7_label_en-US" xlink:label="lab_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geographical [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7" xlink:to="lab_us-gaap_SegmentGeographicalDomain_A1DB3F3712ACF3EDC0204260352301E7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Basis of Pricing [Axis]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Basis of Pricing [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C" xlink:to="lab_us-gaap_ContractWithCustomerBasisOfPricingAxis_C8FEF37F9CDE2DF022CF426035230C7C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Basis of Pricing [Domain]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Basis of Pricing [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF" xlink:to="lab_us-gaap_ContractWithCustomerBasisOfPricingDomain_08BF322EAC821EEAAA6642603523B6EF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Duration [Axis]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Duration [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerDurationAxis" xlink:label="loc_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97" xlink:to="lab_us-gaap_ContractWithCustomerDurationAxis_CC599D5A26299F23AEFA426035238C97" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerDurationDomain_3C6440EB0340E5E0AA92426035233C86_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerDurationDomain_3C6440EB0340E5E0AA92426035233C86" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Duration [Domain]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerDurationDomain_3C6440EB0340E5E0AA92426035233C86_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerDurationDomain_3C6440EB0340E5E0AA92426035233C86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Duration [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerDurationDomain" xlink:label="loc_us-gaap_ContractWithCustomerDurationDomain_3C6440EB0340E5E0AA92426035233C86" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596_terseLabel_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Axis]</link:label>
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596_label_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596" xlink:to="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_45FDE7B162B0F2247645426035233596" xlink:type="arc" />
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4_terseLabel_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Domain]</link:label>
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4_label_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4" xlink:to="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_DBCCC426F0E9A31EB11A42603523ABF4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Sales Channel [Axis]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Sales Channel [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelAxis" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE" xlink:to="lab_us-gaap_ContractWithCustomerSalesChannelAxis_66AC726BAA3B88FA122A42603523DEEE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Sales Channel [Domain]</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Sales Channel [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B" xlink:to="lab_us-gaap_ContractWithCustomerSalesChannelDomain_4A096AE899AD3E1BB0D9426035235F9B" xlink:type="arc" />
    <link:label id="lab_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591_terseLabel_en-US" xlink:label="lab_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer [Axis]</link:label>
    <link:label id="lab_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591_label_en-US" xlink:label="lab_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MajorCustomersAxis" xlink:label="loc_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591" xlink:to="lab_us-gaap_MajorCustomersAxis_D6D3238288548E07043C42603523B591" xlink:type="arc" />
    <link:label id="lab_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F_terseLabel_en-US" xlink:label="lab_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer [Domain]</link:label>
    <link:label id="lab_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F_label_en-US" xlink:label="lab_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F" xlink:to="lab_us-gaap_NameOfMajorCustomerDomain_67B66FF0E54A1E57EBF242603523658F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Line Items]</link:label>
    <link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disaggregation of Revenue [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF" xlink:to="lab_us-gaap_DisaggregationOfRevenueLineItems_EE941A6ACC4919944461426035237BEF" xlink:type="arc" />
    <link:label id="lab_us-gaap_Revenues_45E8C8E090B06D104DDE42603523D8E1_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_45E8C8E090B06D104DDE42603523D8E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Revenue</link:label>
    <link:label id="lab_us-gaap_Revenues_45E8C8E090B06D104DDE42603523D8E1_label_en-US" xlink:label="lab_us-gaap_Revenues_45E8C8E090B06D104DDE42603523D8E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
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    <link:label id="lab_htld_FuelSurchargeRevenue_C63D9AEA1A20893A27E242603523E7CE_terseLabel_en-US" xlink:label="lab_htld_FuelSurchargeRevenue_C63D9AEA1A20893A27E242603523E7CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fuel surcharge revenue</link:label>
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    <link:label id="lab_us-gaap_RealEstateMember_B77CD2917EF25391C3173C402D6DA3B7_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateMember_B77CD2917EF25391C3173C402D6DA3B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Options</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_BE4DDC29801BB4AEEE3E7272622DE63A_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_BE4DDC29801BB4AEEE3E7272622DE63A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_BE4DDC29801BB4AEEE3E7272622DE63A_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_BE4DDC29801BB4AEEE3E7272622DE63A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transactions Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementAbstract_7F1736BA8F5FA08A5A3941564AE11DCF_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_7F1736BA8F5FA08A5A3941564AE11DCF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_7F1736BA8F5FA08A5A3941564AE11DCF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_581FA5418FA88274ABA941564AE1BA35_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_581FA5418FA88274ABA941564AE1BA35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Expenses</link:label>
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_581FA5418FA88274ABA941564AE1BA35_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_581FA5418FA88274ABA941564AE1BA35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_581FA5418FA88274ABA941564AE1BA35" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LaborAndRelatedExpense_2CE16FE24C6C7F5A83D041564AE1F0F0_terseLabel_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_2CE16FE24C6C7F5A83D041564AE1F0F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Salaries, wages, and benefits</link:label>
    <link:label id="lab_us-gaap_LaborAndRelatedExpense_2CE16FE24C6C7F5A83D041564AE1F0F0_label_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_2CE16FE24C6C7F5A83D041564AE1F0F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Labor and Related Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_2CE16FE24C6C7F5A83D041564AE1F0F0" xlink:type="locator" />
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    <link:label id="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9_terseLabel_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rent and purchased transportation</link:label>
    <link:label id="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9_label_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rent and purchased transportation</link:label>
    <link:label id="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9_documentation_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment of rentals incurred in the period on property and equipment including payments made to independent contractors for providing and operating revenue equipment owned and maintained by independent contractors.</link:label>
    <link:loc xlink:href="htld-20180331.xsd#htld_RentAndPurchasedTransportation" xlink:label="loc_htld_RentAndPurchasedTransportation_4732AD9C24B39205133D41564AE15FC9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FuelCosts_8310C064929ECF994B3241564AE1CDB3_terseLabel_en-US" xlink:label="lab_us-gaap_FuelCosts_8310C064929ECF994B3241564AE1CDB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fuel</link:label>
    <link:label id="lab_us-gaap_FuelCosts_8310C064929ECF994B3241564AE1CDB3_label_en-US" xlink:label="lab_us-gaap_FuelCosts_8310C064929ECF994B3241564AE1CDB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fuel Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FuelCosts" xlink:label="loc_us-gaap_FuelCosts_8310C064929ECF994B3241564AE1CDB3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_C71A721F232AD9637CF241564AE1774E_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_C71A721F232AD9637CF241564AE1774E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operations and maintenance</link:label>
    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_C71A721F232AD9637CF241564AE1774E_label_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_C71A721F232AD9637CF241564AE1774E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Services, Maintenance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfServicesMaintenanceCosts" xlink:label="loc_us-gaap_CostOfServicesMaintenanceCosts_C71A721F232AD9637CF241564AE1774E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating taxes and licenses</link:label>
    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD_label_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Services, Direct Taxes and Licenses Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostOfServicesDirectTaxesAndLicensesCosts" xlink:label="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD" xlink:to="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_A69648DB042229F3F3E141564AE121FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_81E592FEE0F728C3A34941564AE14ABF_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_81E592FEE0F728C3A34941564AE14ABF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance and claims</link:label>
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_81E592FEE0F728C3A34941564AE14ABF_label_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_81E592FEE0F728C3A34941564AE14ABF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Insurance and Claims Costs, Production</link:label>
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    <link:label id="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9F0395939E7D7D64F9A341564AE13001_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9F0395939E7D7D64F9A341564AE13001" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Communications and utilities</link:label>
    <link:label id="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9F0395939E7D7D64F9A341564AE13001_label_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9F0395939E7D7D64F9A341564AE13001" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Direct Communications and Utilities Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DirectCommunicationsAndUtilitiesCosts" xlink:label="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_9F0395939E7D7D64F9A341564AE13001" xlink:type="locator" />
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    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9_verboseLabel_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9_label_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">depreciation and amortization excluding depreciation on communication equipment</link:label>
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9_documentation_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_E90938DD4B4F7F982D4A41564AE1F7B9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">depreciation and amortization excluding depreciation on communication equipment</link:label>
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    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_2225D0DAEB49F31DD43241564AE10252_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_2225D0DAEB49F31DD43241564AE10252" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other operating expenses</link:label>
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_2225D0DAEB49F31DD43241564AE10252_label_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_2225D0DAEB49F31DD43241564AE10252" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Cost and Expense, Operating</link:label>
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    <link:label id="lab_us-gaap_CostsAndExpenses_F36FBAB114647FDEF68241564AE1E688_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_F36FBAB114647FDEF68241564AE1E688" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total operating expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpenses_F36FBAB114647FDEF68241564AE1E688_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_F36FBAB114647FDEF68241564AE1E688" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_F36FBAB114647FDEF68241564AE1E688" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_FC84B808AB970A6B303C41564AE16C35_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_FC84B808AB970A6B303C41564AE16C35" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating income</link:label>
    <link:label id="lab_us-gaap_OperatingIncomeLoss_FC84B808AB970A6B303C41564AE16C35_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_FC84B808AB970A6B303C41564AE16C35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
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    <link:label id="lab_us-gaap_InvestmentIncomeInterest_36E200D56851808A273D41564AE1BAED_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_36E200D56851808A273D41564AE1BAED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_us-gaap_InvestmentIncomeInterest_36E200D56851808A273D41564AE1BAED_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_36E200D56851808A273D41564AE1BAED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Income, Interest</link:label>
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