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  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_htld_RelatedPartyAbstract_87FBEED55DA2FDBCF223EDA86DF1F10B_label_en-US" xlink:label="lab_htld_RelatedPartyAbstract_87FBEED55DA2FDBCF223EDA86DF1F10B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5F5B60D5729B7282968EDA86DF2B1DE_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_A5F5B60D5729B7282968EDA86DF2B1DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Related Party Transactions, by Related Party [Table]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_72D117643E1D5EAF0856EDA86DF2F062_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_72D117643E1D5EAF0856EDA86DF2F062" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_72D117643E1D5EAF0856EDA86DF2F062_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_72D117643E1D5EAF0856EDA86DF2F062" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_3EDCF0EEDC8FBB454491EDA86DF2FCE4" xlink:type="arc" />
    <link:label id="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9_terseLabel_en-US" xlink:label="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tractors [Member]</link:label>
    <link:label id="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9_label_en-US" xlink:label="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tractors [Member]</link:label>
    <link:label id="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9_documentation_en-US" xlink:label="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tractors [Member]</link:label>
    <link:loc xlink:href="htld-20170331.xsd#htld_TractorsMember" xlink:label="loc_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:to="lab_htld_TractorsMember_EB9FE374C60C95578AD5EDA86DF2C3A9" xlink:type="arc" />
    <link:label id="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506_terseLabel_en-US" xlink:label="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trailers [Member]</link:label>
    <link:label id="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506_label_en-US" xlink:label="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trailers [Member]</link:label>
    <link:label id="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506_documentation_en-US" xlink:label="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Trailers [Member]</link:label>
    <link:loc xlink:href="htld-20170331.xsd#htld_TrailersMember" xlink:label="loc_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:to="lab_htld_TrailersMember_8A4C26CBE0E58B974EA5EDA86DF2B506" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D" 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_41AC21A329D73F73C926EDA86DF2E96D_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D" xlink:to="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_41AC21A329D73F73C926EDA86DF2E96D" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7" 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_167D31B49126883F7713EDA86DF2FDA7_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7" xlink:to="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_167D31B49126883F7713EDA86DF2FDA7" xlink:type="arc" />
    <link:label id="lab_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759_terseLabel_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" 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_8269D4B8CDAEC9CB00ECEDA86DF28759_label_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" 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_8269D4B8CDAEC9CB00ECEDA86DF28759_documentation_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Terminal Facilities [Member]</link:label>
    <link:loc xlink:href="htld-20170331.xsd#htld_TerminalFacilitiesMember" xlink:label="loc_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" xlink:to="lab_htld_TerminalFacilitiesMember_8269D4B8CDAEC9CB00ECEDA86DF28759" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_007E6BDC234504BCCBE7EDA86DF23C45_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_007E6BDC234504BCCBE7EDA86DF23C45" 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_007E6BDC234504BCCBE7EDA86DF23C45_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_007E6BDC234504BCCBE7EDA86DF23C45" 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:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseArrangementTypeAxis_007E6BDC234504BCCBE7EDA86DF23C45" xlink:to="lab_us-gaap_LeaseArrangementTypeAxis_007E6BDC234504BCCBE7EDA86DF23C45" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E" 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_285B66627607B693B452EDA86DF2CD1E_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseArrangementTypeDomain" xlink:label="loc_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E" xlink:to="lab_us-gaap_LeaseArrangementTypeDomain_285B66627607B693B452EDA86DF2CD1E" xlink:type="arc" />
    <link:label id="lab_htld_RelatedPartyMember_8902E5F38B55C3366A8CEDA86DF2F8EF_terseLabel_en-US" xlink:label="lab_htld_RelatedPartyMember_8902E5F38B55C3366A8CEDA86DF2F8EF" 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_8902E5F38B55C3366A8CEDA86DF2F8EF_label_en-US" xlink:label="lab_htld_RelatedPartyMember_8902E5F38B55C3366A8CEDA86DF2F8EF" 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_8902E5F38B55C3366A8CEDA86DF2F8EF_documentation_en-US" xlink:label="lab_htld_RelatedPartyMember_8902E5F38B55C3366A8CEDA86DF2F8EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
    <link:loc xlink:href="htld-20170331.xsd#htld_RelatedPartyMember" xlink:label="loc_htld_RelatedPartyMember_8902E5F38B55C3366A8CEDA86DF2F8EF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_55FD4B23FD6CFF64C4EFEDA86DF2216B_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_55FD4B23FD6CFF64C4EFEDA86DF2216B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_55FD4B23FD6CFF64C4EFEDA86DF2216B_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_55FD4B23FD6CFF64C4EFEDA86DF2216B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
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    <link:label id="lab_us-gaap_LeaseAndRentalExpense_93D526D9563A5B027B5BEDD02EABC931_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_93D526D9563A5B027B5BEDD02EABC931" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_93D526D9563A5B027B5BEDD02EABC931_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_93D526D9563A5B027B5BEDD02EABC931" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
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    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C_terseLabel_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of revenue equipment traded</link:label>
    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C_label_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair value of revenue equipment traded</link:label>
    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C_documentation_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_3FD46BB9204204520D41EDA86DF3344C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Fair value of revenue equipment traded</link:label>
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    <link:label id="lab_us-gaap_DueToRelatedPartiesCurrent_F7AC44271D6ABEE3E575EDA86DF3613E_label_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesCurrent_F7AC44271D6ABEE3E575EDA86DF3613E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due to Related Parties, Current</link:label>
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    <link:label id="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF_terseLabel_en-US" xlink:label="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">related party payment for terminal purchase</link:label>
    <link:label id="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF_label_en-US" xlink:label="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">related party payment for terminal purchase</link:label>
    <link:label id="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF_documentation_en-US" xlink:label="lab_htld_Relatedpartypaymentforterminalpurchase_80B260398F285223F8B3EDA86DF33DAF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">related party payment for terminal purchase</link:label>
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    <link:label id="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83_terseLabel_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments for parts and services</link:label>
    <link:label id="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83_label_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for parts and services</link:label>
    <link:label id="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83_documentation_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payments for parts and services</link:label>
    <link:loc xlink:href="htld-20170331.xsd#htld_Paymentsforpartsandservices" xlink:label="loc_htld_Paymentsforpartsandservices_B86E63FF36B0B89419B3EDA86DF3FC83" xlink:type="locator" />
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    <link:label id="lab_htld_ShareRepurchasesAbstract_FEEFA3C82D9060438AFB68626762B639_label_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_BBC8750BC56B58DE8ADF89480C7143D6" 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_FEEFA3C82D9060438AFB68626762B639_documentation_en-US" xlink:label="lab_htld_ShareRepurchasesAbstract_BBC8750BC56B58DE8ADF89480C7143D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Note 10.  Share Repurchases [Abstract]</link:label>
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    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_AA1B5294D85F38034FF16862676269CB_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_25E802FCF70C5AD482382A63D30F63C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stockholders' Equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_AA1B5294D85F38034FF16862676269CB_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_25E802FCF70C5AD482382A63D30F63C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_060344EA333CD3C466806862673ADE5A_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_C41645A8F51B5200887D3AF8715AC339" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Disclosure [Abstract]</link:label>
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    <link:label id="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_96BAE09BAB96F7F8DAAE6862673A9B02_terseLabel_en-US" xlink:label="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_CB5A90301BF959EABD9241D7B20FCB39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Unrecognized Tax Benefits</link:label>
    <link:label id="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_96BAE09BAB96F7F8DAAE6862673A9B02_label_en-US" xlink:label="lab_us-gaap_SummaryOfPositionsForWhichSignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleTextBlock_CB5A90301BF959EABD9241D7B20FCB39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_LeasesAbstract_A84B880C598CD16E8D1CEDA86DFA1D85_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_A84B880C598CD16E8D1CEDA86DFA1D85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leases [Abstract]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_EA50ED6D263A2979D2E8EDA86DFB53D3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_EA50ED6D263A2979D2E8EDA86DFB53D3" 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_EA50ED6D263A2979D2E8EDA86DFB53D3_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_EA50ED6D263A2979D2E8EDA86DFB53D3" 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_BusinessAcquisitionAxis_2B18D18FA66EB75A4F83EDA86DFB6F49_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_2B18D18FA66EB75A4F83EDA86DFB6F49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
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    <link:label id="lab_us-gaap_OperatingExpensesAbstract_B60B9FDDB627544A80E36862676CF5EB_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_4FD1ABF24EC25814A3C0F5F1E32147EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LaborAndRelatedExpense_EB02DB29E4A822B0410E6862676C8C78_terseLabel_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_CDE8952AC7495683A6B33364AE53516A" 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_EB02DB29E4A822B0410E6862676C8C78_label_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_CDE8952AC7495683A6B33364AE53516A" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LaborAndRelatedExpense" xlink:label="loc_us-gaap_LaborAndRelatedExpense_CDE8952AC7495683A6B33364AE53516A" xlink:type="locator" />
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    <link:label id="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4_terseLabel_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_FF5C927EE0A558118DFCFC99659E159F" 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_ED9867D67EFDAFE4490C6862676C2CA4_label_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_FF5C927EE0A558118DFCFC99659E159F" 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_ED9867D67EFDAFE4490C6862676C2CA4_documentation_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_FF5C927EE0A558118DFCFC99659E159F" 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-20170331.xsd#htld_RentAndPurchasedTransportation" xlink:label="loc_htld_RentAndPurchasedTransportation_FF5C927EE0A558118DFCFC99659E159F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC_terseLabel_en-US" xlink:label="lab_us-gaap_FuelCosts_8A349A34F12F5F07A0DFC44A6040831C" 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_9E449F7810D2B411FD076862676CFCBC_label_en-US" xlink:label="lab_us-gaap_FuelCosts_8A349A34F12F5F07A0DFC44A6040831C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fuel Costs</link:label>
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    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_7DDFD58AB9C45AA6BAB0C7B14D319925" 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_753371E51E17875DC5946862676C30DC_label_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_7DDFD58AB9C45AA6BAB0C7B14D319925" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServicesMaintenanceCosts" xlink:label="loc_us-gaap_CostOfServicesMaintenanceCosts_7DDFD58AB9C45AA6BAB0C7B14D319925" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesMaintenanceCosts_7DDFD58AB9C45AA6BAB0C7B14D319925" xlink:to="lab_us-gaap_CostOfServicesMaintenanceCosts_7DDFD58AB9C45AA6BAB0C7B14D319925" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_8E43FC96CF5B5205A3783AA39E8F12A9" 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_3322A88EC302920B47116862676C61B9_label_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_8E43FC96CF5B5205A3783AA39E8F12A9" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServicesDirectTaxesAndLicensesCosts" xlink:label="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_8E43FC96CF5B5205A3783AA39E8F12A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_8E43FC96CF5B5205A3783AA39E8F12A9" xlink:to="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_8E43FC96CF5B5205A3783AA39E8F12A9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_E30C20A6AEDB3076B3016862676C50EE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_CF45C88D71555D79BB6F67C790E670C1" 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_E30C20A6AEDB3076B3016862676C50EE_label_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_CF45C88D71555D79BB6F67C790E670C1" 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_9CBD6AABD5F8B38E35FD6862676C24DD_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_85AE1F8169CA591293CDFD0C3554C339" 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_9CBD6AABD5F8B38E35FD6862676C24DD_label_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_85AE1F8169CA591293CDFD0C3554C339" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DirectCommunicationsAndUtilitiesCosts" xlink:label="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_85AE1F8169CA591293CDFD0C3554C339" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_85AE1F8169CA591293CDFD0C3554C339" xlink:to="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_85AE1F8169CA591293CDFD0C3554C339" xlink:type="arc" />
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D_verboseLabel_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" 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_33EDAD1CDE327FB8DF006862676C259D_label_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" 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_33EDAD1CDE327FB8DF006862676C259D_documentation_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" 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>
    <link:loc xlink:href="htld-20170331.xsd#htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment" xlink:label="loc_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" xlink:to="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_3C671DF935BF5421B7AF1F4F1E8CBAB0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_C96009EEB2B957EE84CB2EB58F42CBA0" 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_C419AD5EFE389912F6036862676C43C0_label_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_C96009EEB2B957EE84CB2EB58F42CBA0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Cost and Expense, Operating</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherCostAndExpenseOperating" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_C96009EEB2B957EE84CB2EB58F42CBA0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_3410A245FCD65E03B1F8FDBCEF16F6AD" 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_095752133DDF6779A9CA6862676CB903_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_3410A245FCD65E03B1F8FDBCEF16F6AD" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_3410A245FCD65E03B1F8FDBCEF16F6AD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_0C29D32BB4AA5371AB833E713DEAE4C9" 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_BBDB10751DC76CB7999A6862676CC906_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_0C29D32BB4AA5371AB833E713DEAE4C9" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_0C29D32BB4AA5371AB833E713DEAE4C9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_F7B8204A088C56BEA0A042493F538EB2" 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_A5779433106369784D136862676C6992_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_F7B8204A088C56BEA0A042493F538EB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_F7B8204A088C56BEA0A042493F538EB2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_74A0C58CD70F5A258DFCF1EB35D11957" 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_B9B55C20C8BF2DFAE9616862676C0DBB_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_74A0C58CD70F5A258DFCF1EB35D11957" 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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    <link:label id="lab_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt_8E08B176A87C5B148BCC08E2F2A90070" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Debt</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_673839E75ED914311A29F34ED7E6CC8E_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_673839E75ED914311A29F34ED7E6CC8E" 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_673839E75ED914311A29F34ED7E6CC8E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_673839E75ED914311A29F34ED7E6CC8E" 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_799DB8BE59878BCC6A65F34ED7E6F5DB_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_799DB8BE59878BCC6A65F34ED7E6F5DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_3D73B2ED8D20A8E1AB06F34ED7E881EA_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_3D73B2ED8D20A8E1AB06F34ED7E881EA" 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_3D73B2ED8D20A8E1AB06F34ED7E881EA_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_3D73B2ED8D20A8E1AB06F34ED7E881EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Deferred Income Taxes</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_5C6DE8B3D7FFE2E11A14F34ED7E8DAF7_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_5C6DE8B3D7FFE2E11A14F34ED7E8DAF7" 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_5C6DE8B3D7FFE2E11A14F34ED7E8DAF7_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_5C6DE8B3D7FFE2E11A14F34ED7E8DAF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_341E1169A6966EBF391DF34ED7E83E4B_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_341E1169A6966EBF391DF34ED7E83E4B" 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_341E1169A6966EBF391DF34ED7E83E4B_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_341E1169A6966EBF391DF34ED7E83E4B" 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>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_869E73B613F3A9431F03F34ED7E900BE_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_869E73B613F3A9431F03F34ED7E900BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in certain working capital items:</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_87A2EBB9B6BFD51C930CF34ED7E9295F_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_87A2EBB9B6BFD51C930CF34ED7E9295F" 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_87A2EBB9B6BFD51C930CF34ED7E9295F_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_87A2EBB9B6BFD51C930CF34ED7E9295F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Receivables</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_CAD295DF0DBDE4BD6F79F34ED7E947B4_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_CAD295DF0DBDE4BD6F79F34ED7E947B4" 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_CAD295DF0DBDE4BD6F79F34ED7E947B4_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_CAD295DF0DBDE4BD6F79F34ED7E947B4" 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_6313E5398FBDAFDF09BCF34ED7E9C7F6_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6313E5398FBDAFDF09BCF34ED7E9C7F6" 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>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B6635334750750095FD4F34ED7E9A4B4_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B6635334750750095FD4F34ED7E9A4B4" 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>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_1117B95383A409462238F34ED7EA8CC8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_1117B95383A409462238F34ED7EA8CC8" 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_1117B95383A409462238F34ED7EA8CC8_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_1117B95383A409462238F34ED7EA8CC8" 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>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_C392C45D78F336B330B5F34ED7EA8536_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_C392C45D78F336B330B5F34ED7EA8536" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in other assets</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BE99DD62C94C927ED3BF34ED7EAB5DF_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BE99DD62C94C927ED3BF34ED7EAB5DF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BE99DD62C94C927ED3BF34ED7EAB5DF_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BE99DD62C94C927ED3BF34ED7EAB5DF" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_8BE99DD62C94C927ED3BF34ED7EAB5DF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ABDA17D63A5A7EAAC597F34ED7EABBEA_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ABDA17D63A5A7EAAC597F34ED7EABBEA" 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_ABDA17D63A5A7EAAC597F34ED7EABBEA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_ABDA17D63A5A7EAAC597F34ED7EABBEA" 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>
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    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_89E464D6A8DD439C4F7AF34ED7EAA755_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_89E464D6A8DD439C4F7AF34ED7EAA755" 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_89E464D6A8DD439C4F7AF34ED7EAA755_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_89E464D6A8DD439C4F7AF34ED7EAA755" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Ordinary Dividends, Common Stock</link:label>
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    <link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_A090A2D756C0D9BAFD0CF34ED7E87AF9_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_A090A2D756C0D9BAFD0CF34ED7E87AF9" 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_A090A2D756C0D9BAFD0CF34ED7E87AF9_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_A090A2D756C0D9BAFD0CF34ED7E87AF9" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_A090A2D756C0D9BAFD0CF34ED7E87AF9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_C5DCCE685D43E6150426F34ED7EA622B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_C5DCCE685D43E6150426F34ED7EA622B" 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_C5DCCE685D43E6150426F34ED7EA622B_label_en-US" xlink:label="lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_C5DCCE685D43E6150426F34ED7EA622B" 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>
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    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_5AFB8B84DD26E08A3FA4F34ED7EA9414_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_5AFB8B84DD26E08A3FA4F34ED7EA9414" 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_5AFB8B84DD26E08A3FA4F34ED7EA9414_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_5AFB8B84DD26E08A3FA4F34ED7EA9414" 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_RepaymentsOfLongTermDebt_FC1F6B4A26C3FE514A27F34ED7EAFD9E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_FC1F6B4A26C3FE514A27F34ED7EAFD9E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repayments on line of credit</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_FC1F6B4A26C3FE514A27F34ED7EAFD9E_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_FC1F6B4A26C3FE514A27F34ED7EAFD9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Long-term Debt</link:label>
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_159C53D261AD29E5851DF34ED7EA84CA_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_159C53D261AD29E5851DF34ED7EA84CA" 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_NetCashProvidedByUsedInFinancingActivities_3B3B2D82DB55129BC783F34ED7EA5B47_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_3B3B2D82DB55129BC783F34ED7EA5B47" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in financing activities</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_F6D7B8C25DB5DDEAADE9F34ED7EA33EE_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_F6D7B8C25DB5DDEAADE9F34ED7EA33EE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase in cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_4919E74419C1E6B0D1E4F34ED7EB2B6B_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_4919E74419C1E6B0D1E4F34ED7EB2B6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash (received) paid during the period for income taxes, net of refunds</link:label>
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_43DACE26A296AB2EC88CF34ED7EBD74E_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_43DACE26A296AB2EC88CF34ED7EBD74E" 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_us-gaap_CapitalExpendituresIncurredButNotYetPaid_EFFDCCC2D6693E214761F34ED7EBB34C_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_EFFDCCC2D6693E214761F34ED7EBB34C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchased property and equipment in accounts payable</link:label>
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    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_F854E4967EFC0D73BE36EA1D68241D18_terseLabel_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_F854E4967EFC0D73BE36EA1D68241D18" 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_F854E4967EFC0D73BE36EA1D68241D18_label_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_F854E4967EFC0D73BE36EA1D68241D18" 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_F854E4967EFC0D73BE36EA1D68241D18_documentation_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_F854E4967EFC0D73BE36EA1D68241D18" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant, Leverage Ratio</link:label>
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    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_9F79B0CAAA07CEB91A6AEA1D68255FCA_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_9F79B0CAAA07CEB91A6AEA1D68255FCA" 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_9F79B0CAAA07CEB91A6AEA1D68255FCA_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_9F79B0CAAA07CEB91A6AEA1D68255FCA" 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_9F79B0CAAA07CEB91A6AEA1D68255FCA_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_9F79B0CAAA07CEB91A6AEA1D68255FCA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
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    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_AC05B1A13293F8DE9DA4EA4A228BE52E_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_AC05B1A13293F8DE9DA4EA4A228BE52E" 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_AC05B1A13293F8DE9DA4EA4A228BE52E_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_AC05B1A13293F8DE9DA4EA4A228BE52E" 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_AC05B1A13293F8DE9DA4EA4A228BE52E_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_AC05B1A13293F8DE9DA4EA4A228BE52E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Tangible Net Worth</link:label>
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_BEB892BE2291B9E92E41EA1DFCD5A40F_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_BEB892BE2291B9E92E41EA1DFCD5A40F" 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_BEB892BE2291B9E92E41EA1DFCD5A40F_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_BEB892BE2291B9E92E41EA1DFCD5A40F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
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    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_E4F9E5381F569AEFE668EA1F059674CD_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_E4F9E5381F569AEFE668EA1F059674CD" 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_E4F9E5381F569AEFE668EA1F059674CD_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_E4F9E5381F569AEFE668EA1F059674CD" 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>
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    <link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_D88950BBB0C7E0855FB3686267266B9E_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_83A32FAF2E8553EC852C6E2D5960A4EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disclosure of restricted stock award activity</link:label>
    <link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_D88950BBB0C7E0855FB3686267266B9E_label_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_83A32FAF2E8553EC852C6E2D5960A4EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_31EC388078640DB970786862674E8B4D_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_212684AA2C5F56C5A6E38A8DE8026959" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_31EC388078640DB970786862674E8B4D_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLessorDisclosureTextBlock_212684AA2C5F56C5A6E38A8DE8026959" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases of Lessor Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_794C4A50235F245A591E6862674E706D_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_B7E5BE6642D851998A353A4D9F5412EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible Assets and Goodwill</link:label>
    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_794C4A50235F245A591E6862674E706D_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_B7E5BE6642D851998A353A4D9F5412EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill and Intangible Assets Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_B9FC8F9022CDD7DE6695F350870F7FAD_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_B9FC8F9022CDD7DE6695F350870F7FAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AssetsAbstract_C66723BD096F2B95F20AF350870FB285_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_C66723BD096F2B95F20AF350870FB285" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_C66723BD096F2B95F20AF350870FB285_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_C66723BD096F2B95F20AF350870FB285" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
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    <link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_D8F800E4E5D87493D768F3508710B805_label_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_D8F800E4E5D87493D768F3508710B805" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Prepaid Expense, Current</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_OtherPrepaidExpenseCurrent_D8F800E4E5D87493D768F3508710B805" xlink:to="lab_us-gaap_OtherPrepaidExpenseCurrent_D8F800E4E5D87493D768F3508710B805" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2" 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_D371724BBC33C65EAF8FF3508710C4F2_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2" xlink:to="lab_us-gaap_OtherAssetsCurrent_D371724BBC33C65EAF8FF3508710C4F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9" 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_AC6095345D6A9549AAF7F3508710D9C9_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxesReceivable" xlink:label="loc_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9" xlink:to="lab_us-gaap_IncomeTaxesReceivable_AC6095345D6A9549AAF7F3508710D9C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842" 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_7A709E73261F4202128BF35087101842_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842" xlink:to="lab_us-gaap_DeferredTaxAssetsNetCurrent_7A709E73261F4202128BF35087101842" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849" 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_D3A9BA86CB68F814E5FFF35087107849_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849" xlink:to="lab_us-gaap_AssetsCurrent_D3A9BA86CB68F814E5FFF35087107849" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC" 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_5E761C1851B38A9B7B15F3508710CEBC_label_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC" xlink:to="lab_us-gaap_AssetsNoncurrentAbstract_5E761C1851B38A9B7B15F3508710CEBC" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598" 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_D775B2EFDD9B8652EC60F35087109598_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGrossAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_D775B2EFDD9B8652EC60F35087109598" xlink:type="arc" />
    <link:label id="lab_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD_terseLabel_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD" 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_94B0A9AF30A7216229D1F3508710D1FD_label_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LandAndLandImprovements" xlink:label="loc_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD" xlink:to="lab_us-gaap_LandAndLandImprovements_94B0A9AF30A7216229D1F3508710D1FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1" 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_E108BAF28A9012A07F18F350871051E1_label_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1" 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/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1" xlink:to="lab_us-gaap_BuildingsAndImprovementsGross_E108BAF28A9012A07F18F350871051E1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C" 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_EF7BE5883E344289049EF3508710007C_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leasehold Improvements, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseholdImprovementsGross" xlink:label="loc_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C" xlink:to="lab_us-gaap_LeaseholdImprovementsGross_EF7BE5883E344289049EF3508710007C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0" 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_B39C66835A1C78052F86F35087100DC0_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Furniture and Fixtures, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FurnitureAndFixturesGross" xlink:label="loc_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0" xlink:to="lab_us-gaap_FurnitureAndFixturesGross_B39C66835A1C78052F86F35087100DC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505_terseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505" 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_D31B5AA3E1EE2A076DE2F3508710C505_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Machinery and Equipment, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505" xlink:to="lab_us-gaap_MachineryAndEquipmentGross_D31B5AA3E1EE2A076DE2F3508710C505" xlink:type="arc" />
    <link:label id="lab_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106_terseLabel_en-US" xlink:label="lab_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" 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_3AA4305EF8561F22601EF35087109106_label_en-US" xlink:label="lab_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" 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_3AA4305EF8561F22601EF35087109106_documentation_en-US" xlink:label="lab_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" 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>
    <link:loc xlink:href="htld-20170331.xsd#htld_RevenueEquipment" xlink:label="loc_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" xlink:to="lab_htld_RevenueEquipment_3AA4305EF8561F22601EF35087109106" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in progress</link:label>
    <link:label id="lab_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in Progress, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7" xlink:to="lab_us-gaap_ConstructionInProgressGross_70DE28A1D9B690A675B6F3508710ACD7" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGross_F5236E39444443A4AC87F35087107E67" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_1C83A7048C20D04506C8F3508710D5A2_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_1C83A7048C20D04506C8F3508710D5A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less accumulated depreciation</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_4014C20761231D10030DF3508711B973_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_4014C20761231D10030DF3508711B973" 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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