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    <link:label id="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2_1A541232CF6290F9C1FF81AE30422BA7_documentation_en-US" xlink:label="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2_1A541232CF6290F9C1FF81AE30422BA7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Period 2</link:label>
    <link:loc xlink:href="htld-20160331.xsd#htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2" xlink:label="loc_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2_1A541232CF6290F9C1FF81AE30422BA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2_1A541232CF6290F9C1FF81AE30422BA7" xlink:to="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2_1A541232CF6290F9C1FF81AE30422BA7" xlink:type="arc" />
    <link:label id="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932_terseLabel_en-US" xlink:label="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Period 3</link:label>
    <link:label id="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932_label_en-US" xlink:label="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Period 3</link:label>
    <link:label id="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932_documentation_en-US" xlink:label="lab_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity, Period 3</link:label>
    <link:loc xlink:href="htld-20160331.xsd#htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3" xlink:label="loc_htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3_A7E8D727FA0451B4B36181AE30424932" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B6BB752310557C35D5EF81AE304209CD_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B6BB752310557C35D5EF81AE304209CD" 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_B6BB752310557C35D5EF81AE304209CD_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B6BB752310557C35D5EF81AE304209CD" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_B6BB752310557C35D5EF81AE304209CD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7" 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_C67B80394C96C161143A81AE3042B2A7_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7" xlink:to="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_C67B80394C96C161143A81AE3042B2A7" xlink:type="arc" />
    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2_terseLabel_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" 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_60F63284741CA46E3AA081AE3042AAD2_label_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" 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_60F63284741CA46E3AA081AE3042AAD2_documentation_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" 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-20160331.xsd#htld_DebtInstrumentCovenantLeverageRatio" xlink:label="loc_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" xlink:to="lab_htld_DebtInstrumentCovenantLeverageRatio_60F63284741CA46E3AA081AE3042AAD2" xlink:type="arc" />
    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" 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_FEB273C6C7508FD42E7081AE30421AC7_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" 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_FEB273C6C7508FD42E7081AE30421AC7_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" 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-20160331.xsd#htld_DebtCovenantMinimumNetIncomeRequirement" xlink:label="loc_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" xlink:to="lab_htld_DebtCovenantMinimumNetIncomeRequirement_FEB273C6C7508FD42E7081AE30421AC7" xlink:type="arc" />
    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E_terseLabel_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Minimum Tangible Net Worth</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" 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_0134A10CFCF90322773E81AE3042896E_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" 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-20160331.xsd#htld_DebtCovenantMinimumTangibleNetWorth" xlink:label="loc_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" xlink:to="lab_htld_DebtCovenantMinimumTangibleNetWorth_0134A10CFCF90322773E81AE3042896E" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740" 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_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740" xlink:to="lab_us-gaap_LineOfCredit_E0CC6D8C516954DE9AAE81AE30420740" xlink:type="arc" />
    <link:label id="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599_terseLabel_en-US" xlink:label="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">letters of credit outstanding on a line of credit</link:label>
    <link:label id="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599_label_en-US" xlink:label="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">letters of credit outstanding on a line of credit</link:label>
    <link:label id="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599_documentation_en-US" xlink:label="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">letters of credit outstanding on a line of credit</link:label>
    <link:loc xlink:href="htld-20160331.xsd#htld_Lettersofcreditoutstandingonalineofcredit" xlink:label="loc_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:to="lab_htld_Lettersofcreditoutstandingonalineofcredit_FC2E7E7451486C04877481AE30422599" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E13784DCD82B36E8C68981AE30423B01_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E13784DCD82B36E8C68981AE30423B01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E13784DCD82B36E8C68981AE30423B01_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E13784DCD82B36E8C68981AE30423B01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_E13784DCD82B36E8C68981AE30423B01" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LeasesAbstract_17CE5092DF83A7A0FABB81B7F2C470FB_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_17CE5092DF83A7A0FABB81B7F2C470FB" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_17CE5092DF83A7A0FABB81B7F2C470FB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_3E9189944137ECA9973C81B7F2CE292F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_3E9189944137ECA9973C81B7F2CE292F" 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_3E9189944137ECA9973C81B7F2CE292F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_3E9189944137ECA9973C81B7F2CE292F" 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_htld_RelatedPartyMember_C47918EAED74E339D51681B7F2CE7674_terseLabel_en-US" xlink:label="lab_htld_RelatedPartyMember_C47918EAED74E339D51681B7F2CE7674" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
    <link:label id="lab_htld_RelatedPartyMember_C47918EAED74E339D51681B7F2CE7674_label_en-US" xlink:label="lab_htld_RelatedPartyMember_C47918EAED74E339D51681B7F2CE7674" 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_C47918EAED74E339D51681B7F2CE7674_documentation_en-US" xlink:label="lab_htld_RelatedPartyMember_C47918EAED74E339D51681B7F2CE7674" 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_BusinessAcquisitionAxis_4140D782BCB81EC1B56581B7F2CE946D_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_4140D782BCB81EC1B56581B7F2CE946D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_4140D782BCB81EC1B56581B7F2CE946D_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_4140D782BCB81EC1B56581B7F2CE946D" 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_LeaseArrangementTypeAxis_80DC4251D064509D8DD181B7F2CE234D_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_80DC4251D064509D8DD181B7F2CE234D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parties to Contractual Arrangement [Axis]</link:label>
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    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_08DC95BCF6AB3B3AF60681B7F2CEAF62_verboseLabel_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_08DC95BCF6AB3B3AF60681B7F2CEAF62" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Receipts for trailer sales</link:label>
    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_08DC95BCF6AB3B3AF60681B7F2CEAF62_label_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_08DC95BCF6AB3B3AF60681B7F2CEAF62" xlink:role="http://www.xbrl.org/2003/role/label" 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_LeaseAndRentalExpense_D0ABD7821AF499EDC65481B7F2CE93F6_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_D0ABD7821AF499EDC65481B7F2CE93F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
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    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_25EAF1E230ADA4B116D381D8E4048397_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_25EAF1E230ADA4B116D381D8E4048397" 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>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_55F60738A5342A634CC781D8E405D6BC_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_55F60738A5342A634CC781D8E405D6BC" 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_55F60738A5342A634CC781D8E405D6BC_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_55F60738A5342A634CC781D8E405D6BC" 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_8BF1F92D478A1B66291681D8E4051C58_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_8BF1F92D478A1B66291681D8E4051C58" 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_8BF1F92D478A1B66291681D8E4051C58_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_8BF1F92D478A1B66291681D8E4051C58" 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_5D393140A7E6E078B8F081D8E4052B9F_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_5D393140A7E6E078B8F081D8E4052B9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">INVESTING ACTIVITIES</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_5D693C6F5F349D21F2F781D8E4057188_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_5D693C6F5F349D21F2F781D8E4057188" 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_5D693C6F5F349D21F2F781D8E4057188_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_5D693C6F5F349D21F2F781D8E4057188" 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_4B22B12F7DF7C794015581D8E405F144_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4B22B12F7DF7C794015581D8E405F144" 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_4B22B12F7DF7C794015581D8E405F144_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4B22B12F7DF7C794015581D8E405F144" 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>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8C68626ECB7F01EB34A481D8E405C356_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8C68626ECB7F01EB34A481D8E405C356" 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_8C68626ECB7F01EB34A481D8E405C356_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_8C68626ECB7F01EB34A481D8E405C356" 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>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_260C63891B8B5E32E18681D8E406F383_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_260C63891B8B5E32E18681D8E406F383" 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_260C63891B8B5E32E18681D8E406F383_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_260C63891B8B5E32E18681D8E406F383" 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_789D3E0D41816E8FF1E881D8E406BC94_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_789D3E0D41816E8FF1E881D8E406BC94" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments of Ordinary Dividends, Common Stock</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_789D3E0D41816E8FF1E881D8E406BC94_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_789D3E0D41816E8FF1E881D8E406BC94" 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_ProceedsFromLinesOfCredit_861B99AAFAB8BC5592F681D8E4060574_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_861B99AAFAB8BC5592F681D8E4060574" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Lines of Credit</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_861B99AAFAB8BC5592F681D8E4060574_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_861B99AAFAB8BC5592F681D8E4060574" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Lines of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_861B99AAFAB8BC5592F681D8E4060574" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_39C20C3B745F94410A6681D8E40608A2_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_39C20C3B745F94410A6681D8E40608A2" 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_39C20C3B745F94410A6681D8E40608A2_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_39C20C3B745F94410A6681D8E40608A2" 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_AA5042B8C40E4AD84C9F81D8E40649C6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AA5042B8C40E4AD84C9F81D8E40649C6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments for Repurchase of Common Stock</link:label>
    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AA5042B8C40E4AD84C9F81D8E40649C6_label_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AA5042B8C40E4AD84C9F81D8E40649C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Repurchase of Common Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_AA5042B8C40E4AD84C9F81D8E40649C6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_3DA33709054B4BC544A181D8E406903B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_3DA33709054B4BC544A181D8E406903B" 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_3DA33709054B4BC544A181D8E406903B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_3DA33709054B4BC544A181D8E406903B" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_3DA33709054B4BC544A181D8E406903B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_58A6A9EA216E58869F6181D8E406C857_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_58A6A9EA216E58869F6181D8E406C857" 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>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_58A6A9EA216E58869F6181D8E406C857_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_58A6A9EA216E58869F6181D8E406C857" 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>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_58A6A9EA216E58869F6181D8E406C857" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestPaid_07ECC17C77BDCC02A20A81D8E41CF560_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaid_07ECC17C77BDCC02A20A81D8E41CF560" 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_07ECC17C77BDCC02A20A81D8E41CF560_label_en-US" xlink:label="lab_us-gaap_InterestPaid_07ECC17C77BDCC02A20A81D8E41CF560" 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_AC2FA8C7664615740E6E81D8E41CD4D9_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_AC2FA8C7664615740E6E81D8E41CD4D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid during the period for income taxes, net of refunds</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_AC2FA8C7664615740E6E81D8E41CD4D9_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_AC2FA8C7664615740E6E81D8E41CD4D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_AC2FA8C7664615740E6E81D8E41CD4D9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_24B4783D24E6A15B697981D8E41C609B_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_24B4783D24E6A15B697981D8E41C609B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Noncash investing and financing activities:</link:label>
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_24B4783D24E6A15B697981D8E41C609B_label_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_24B4783D24E6A15B697981D8E41C609B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
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    <link:label id="lab_htld_FairValueOfRevenueEquipmentTraded_C2A3E450FE07E9A3E06781D8E41CBD23_terseLabel_en-US" xlink:label="lab_htld_FairValueOfRevenueEquipmentTraded_C2A3E450FE07E9A3E06781D8E41CBD23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" 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_CapitalExpendituresIncurredButNotYetPaid_0D8757AC2E55B6AAD2D581D8E41CBB48_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_0D8757AC2E55B6AAD2D581D8E41CBB48" 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>
    <link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_0D8757AC2E55B6AAD2D581D8E41CBB48_label_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_0D8757AC2E55B6AAD2D581D8E41CBB48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Expenditures Incurred but Not yet Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_0D8757AC2E55B6AAD2D581D8E41CBB48" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments_1F18285C0842316B455681D8E41C416C_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments_1F18285C0842316B455681D8E41C416C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sold property and equipment in other current assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments_1F18285C0842316B455681D8E41C416C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments_1F18285C0842316B455681D8E41C416C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Restricted Cash and Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments" xlink:label="loc_us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments_1F18285C0842316B455681D8E41C416C" xlink:type="locator" />
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    <link:label id="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517_terseLabel_en-US" xlink:label="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock dividends declared in accounts payable</link:label>
    <link:label id="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517_label_en-US" xlink:label="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Dividends Declared In Accounts Payable</link:label>
    <link:label id="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517_documentation_en-US" xlink:label="lab_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Common Stock Dividends Declared In Accounts Payable</link:label>
    <link:loc xlink:href="htld-20160331.xsd#htld_CommonStockDividendsDeclaredInAccountsPayable" xlink:label="loc_htld_CommonStockDividendsDeclaredInAccountsPayable_A354B9156D9D3520EB5081D8E41C7517" xlink:type="locator" />
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    <link:label id="lab_htld_SegmentInformationAbstract_41912F1C62149B5569398112CFB2576B_label_en-US" xlink:label="lab_htld_SegmentInformationAbstract_41912F1C62149B5569398112CFB2576B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Information [Abstract]</link:label>
    <link:label id="lab_htld_SegmentInformationAbstract_41912F1C62149B5569398112CFB2576B_documentation_en-US" xlink:label="lab_htld_SegmentInformationAbstract_41912F1C62149B5569398112CFB2576B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Segment Information [Abstract]</link:label>
    <link:loc xlink:href="htld-20160331.xsd#htld_SegmentInformationAbstract" xlink:label="loc_htld_SegmentInformationAbstract_41912F1C62149B5569398112CFB2576B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NumberOfReportableSegments_C7CB3AFFEF558C8CD4278112CFB74289_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_C7CB3AFFEF558C8CD4278112CFB74289" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Segments</link:label>
    <link:label id="lab_us-gaap_NumberOfReportableSegments_C7CB3AFFEF558C8CD4278112CFB74289_label_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_C7CB3AFFEF558C8CD4278112CFB74289" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Reportable Segments</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_F6EDE50618C0ED31810581E336C28DC4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_F6EDE50618C0ED31810581E336C28DC4" 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>
    <link:label id="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_F6EDE50618C0ED31810581E336C28DC4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_F6EDE50618C0ED31810581E336C28DC4" xlink:role="http://www.xbrl.org/2003/role/label" 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_RelatedPartyTransactionLineItems_509205764EF3393F1D9F81E336C35CBD_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_509205764EF3393F1D9F81E336C35CBD" 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_509205764EF3393F1D9F81E336C35CBD_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_509205764EF3393F1D9F81E336C35CBD" 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_DueToRelatedPartiesCurrent_B595B118DE8740888CCC81E336C3AE05_terseLabel_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesCurrent_B595B118DE8740888CCC81E336C3AE05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due to Related Parties, Current</link:label>
    <link:label id="lab_us-gaap_DueToRelatedPartiesCurrent_B595B118DE8740888CCC81E336C3AE05_label_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesCurrent_B595B118DE8740888CCC81E336C3AE05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due to Related Parties, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_B595B118DE8740888CCC81E336C3AE05" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireMachineryAndEquipment_0B1BA2CEAB3A4B34567F81E336C323EF_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMachineryAndEquipment_0B1BA2CEAB3A4B34567F81E336C323EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payments for tractor purchase</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireMachineryAndEquipment_0B1BA2CEAB3A4B34567F81E336C323EF_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMachineryAndEquipment_0B1BA2CEAB3A4B34567F81E336C323EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Machinery and Equipment</link:label>
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    <link:label id="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235_negatedTerseLabel_en-US" xlink:label="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Receipts for tractor sales</link:label>
    <link:label id="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235_label_en-US" xlink:label="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receipts for tractor sales</link:label>
    <link:label id="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235_documentation_en-US" xlink:label="lab_htld_Receiptsfortractorsales_735D61B16C4EADA6C5AB81E336C38235" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Receipts for tractor sales</link:label>
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    <link:label id="lab_htld_Receiptsfortrailersales_AFEC69C0CC20D906BE7081E336C32CB6_negatedTerseLabel_en-US" xlink:label="lab_htld_Receiptsfortrailersales_AFEC69C0CC20D906BE7081E336C32CB6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Receipts for trailer sales</link:label>
    <link:label id="lab_htld_Receiptsfortrailersales_AFEC69C0CC20D906BE7081E336C32CB6_label_en-US" xlink:label="lab_htld_Receiptsfortrailersales_AFEC69C0CC20D906BE7081E336C32CB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receipts for trailer sales</link:label>
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    <link:label id="lab_htld_Paymentsforpartsandservices_74526D267A4FBB6D7F4181E336C36BBA_terseLabel_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_74526D267A4FBB6D7F4181E336C36BBA" 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_74526D267A4FBB6D7F4181E336C36BBA_label_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_74526D267A4FBB6D7F4181E336C36BBA" 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_74526D267A4FBB6D7F4181E336C36BBA_documentation_en-US" xlink:label="lab_htld_Paymentsforpartsandservices_74526D267A4FBB6D7F4181E336C36BBA" 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-20160331.xsd#htld_Paymentsforpartsandservices" xlink:label="loc_htld_Paymentsforpartsandservices_74526D267A4FBB6D7F4181E336C36BBA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdministrativeServicesRevenue_CA970243E158B654F81381E336C3DA2B_terseLabel_en-US" xlink:label="lab_us-gaap_AdministrativeServicesRevenue_CA970243E158B654F81381E336C3DA2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Administrative Services Revenue</link:label>
    <link:label id="lab_us-gaap_AdministrativeServicesRevenue_CA970243E158B654F81381E336C3DA2B_label_en-US" xlink:label="lab_us-gaap_AdministrativeServicesRevenue_CA970243E158B654F81381E336C3DA2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Administrative Services Revenue</link:label>
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    <link:label id="lab_us-gaap_DueFromRelatedPartiesCurrent_02BD9BDDDD39DFBF5F6781E336C3B8ED_terseLabel_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesCurrent_02BD9BDDDD39DFBF5F6781E336C3B8ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due from Related Parties, Current</link:label>
    <link:label id="lab_us-gaap_DueFromRelatedPartiesCurrent_02BD9BDDDD39DFBF5F6781E336C3B8ED_label_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesCurrent_02BD9BDDDD39DFBF5F6781E336C3B8ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due from Related Parties, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DueFromRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesCurrent_02BD9BDDDD39DFBF5F6781E336C3B8ED" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostsAndExpensesRelatedParty_0DDE8089531769556D2F81E336C37B4C_terseLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpensesRelatedParty_0DDE8089531769556D2F81E336C37B4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Costs and Expenses, Related Party</link:label>
    <link:label id="lab_us-gaap_CostsAndExpensesRelatedParty_0DDE8089531769556D2F81E336C37B4C_label_en-US" xlink:label="lab_us-gaap_CostsAndExpensesRelatedParty_0DDE8089531769556D2F81E336C37B4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses, Related Party</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpensesRelatedParty" xlink:label="loc_us-gaap_CostsAndExpensesRelatedParty_0DDE8089531769556D2F81E336C37B4C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Equipment, and Depreciation</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_C19FF8EDA2C7387F78F0A9EC6B6681DA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_AE0DAD936FC6CE561069780FAFDEE0D9_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_AE0DAD936FC6CE561069780FAFDEE0D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation and New Accounting Pronouncements [Policy Text Block]</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_AE0DAD936FC6CE561069780FAFDEE0D9_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_AE0DAD936FC6CE561069780FAFDEE0D9" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_AE0DAD936FC6CE561069780FAFDEE0D9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_UseOfEstimates_F87C9B1F3376D9AFC28D780FAFDE5B3B_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_F87C9B1F3376D9AFC28D780FAFDE5B3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_F87C9B1F3376D9AFC28D780FAFDE5B3B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_C05708817977390BD0C4780FAFDE4D26_label_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_C05708817977390BD0C4780FAFDE4D26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_SegmentReportingPolicyPolicyTextBlock_C05708817977390BD0C4780FAFDE4D26" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_FFAC72A54BA411241811780FAFDE5D22_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_FFAC72A54BA411241811780FAFDE5D22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_7E6173496293BA64A31D780FAFDE73D3_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_7E6173496293BA64A31D780FAFDE73D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_3D7160D9C0172F2828D7780FAFDEF074_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_3D7160D9C0172F2828D7780FAFDEF074" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</link:label>
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    <link:label id="lab_us-gaap_GoodwillAcquiredDuringPeriod_D90A3E470AF1F64AD9A3A9EC6D2C1914_label_en-US" xlink:label="lab_us-gaap_GoodwillAcquiredDuringPeriod_D90A3E470AF1F64AD9A3A9EC6D2C1914" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Acquired During Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_D90A3E470AF1F64AD9A3A9EC6D2C1914" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Goodwill_5912675358F6AD1F5EB2A9EC6D2CD37E_periodEndLabel_en-US" xlink:label="lab_us-gaap_Goodwill_5912675358F6AD1F5EB2A9EC6D2CD37E" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Goodwill, Ending Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5912675358F6AD1F5EB2A9EC6D2CD37E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_5912675358F6AD1F5EB2A9EC6D2CD37E" xlink:to="lab_us-gaap_Goodwill_5912675358F6AD1F5EB2A9EC6D2CD37E" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementAbstract_2460DA4BBBFDC47BD4FCA9EC6D8A373D_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_2460DA4BBBFDC47BD4FCA9EC6D8A373D" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_2460DA4BBBFDC47BD4FCA9EC6D8A373D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4" 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_35D4971448FEDC41F876A9EC6D8AE4F4_label_en-US" xlink:label="lab_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4" xlink:to="lab_us-gaap_Revenues_35D4971448FEDC41F876A9EC6D8AE4F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_1AE2EE87E5F35D57ED3DA9EC6D8AFBFF_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_1AE2EE87E5F35D57ED3DA9EC6D8AFBFF" 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_1AE2EE87E5F35D57ED3DA9EC6D8AFBFF_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_1AE2EE87E5F35D57ED3DA9EC6D8AFBFF" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_1AE2EE87E5F35D57ED3DA9EC6D8AFBFF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LaborAndRelatedExpense_1EE05888A1F9F85154D6A9EC6D994057_terseLabel_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_1EE05888A1F9F85154D6A9EC6D994057" 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_1EE05888A1F9F85154D6A9EC6D994057_label_en-US" xlink:label="lab_us-gaap_LaborAndRelatedExpense_1EE05888A1F9F85154D6A9EC6D994057" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Labor and Related Expense</link:label>
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    <link:label id="lab_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB_terseLabel_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" 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_235A9953BC4287367018A9EC6D9902CB_label_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" 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_235A9953BC4287367018A9EC6D9902CB_documentation_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" 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-20160331.xsd#htld_RentAndPurchasedTransportation" xlink:label="loc_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" xlink:to="lab_htld_RentAndPurchasedTransportation_235A9953BC4287367018A9EC6D9902CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FuelCosts_BBD04C6AC3252160DB95A9EC6D99E144_terseLabel_en-US" xlink:label="lab_us-gaap_FuelCosts_BBD04C6AC3252160DB95A9EC6D99E144" 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_BBD04C6AC3252160DB95A9EC6D99E144_label_en-US" xlink:label="lab_us-gaap_FuelCosts_BBD04C6AC3252160DB95A9EC6D99E144" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FuelCosts" xlink:label="loc_us-gaap_FuelCosts_BBD04C6AC3252160DB95A9EC6D99E144" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47" 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_FB8E9AFAC91EE7799E54A9EC6D992D47_label_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfServicesMaintenanceCosts" xlink:label="loc_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47" xlink:to="lab_us-gaap_CostOfServicesMaintenanceCosts_FB8E9AFAC91EE7799E54A9EC6D992D47" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA" 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_D75C3381EC22D7824B35A9EC6D9926AA_label_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfServicesDirectTaxesAndLicensesCosts" xlink:label="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA" xlink:to="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_D75C3381EC22D7824B35A9EC6D9926AA" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_3E5AC546946BB178404CA9EC6D99F770_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_3E5AC546946BB178404CA9EC6D99F770" 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_3E5AC546946BB178404CA9EC6D99F770_label_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_3E5AC546946BB178404CA9EC6D99F770" 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_33FAD0BB0373251F8759A9EC6D994CDC_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_33FAD0BB0373251F8759A9EC6D994CDC" 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_33FAD0BB0373251F8759A9EC6D994CDC_label_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_33FAD0BB0373251F8759A9EC6D994CDC" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DirectCommunicationsAndUtilitiesCosts" xlink:label="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_33FAD0BB0373251F8759A9EC6D994CDC" xlink:type="locator" />
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    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_81FC1F0F355C10B902B6A9EC6D99B600_verboseLabel_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_81FC1F0F355C10B902B6A9EC6D99B600" 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_81FC1F0F355C10B902B6A9EC6D99B600_label_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_81FC1F0F355C10B902B6A9EC6D99B600" 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_81FC1F0F355C10B902B6A9EC6D99B600_documentation_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_81FC1F0F355C10B902B6A9EC6D99B600" 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_BAB8342A25461F267D93A9EC6D990A01_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_BAB8342A25461F267D93A9EC6D990A01" 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_BAB8342A25461F267D93A9EC6D990A01_label_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_BAB8342A25461F267D93A9EC6D990A01" 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_9AB19BE4E5078883C20BA9EC6D994318_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_9AB19BE4E5078883C20BA9EC6D994318" 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_9AB19BE4E5078883C20BA9EC6D994318_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_9AB19BE4E5078883C20BA9EC6D994318" 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/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_9AB19BE4E5078883C20BA9EC6D994318" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Supplies_93ABC37F76352FCBF91397C27388B5DA_label_en-US" xlink:label="lab_us-gaap_Supplies_93ABC37F76352FCBF91397C27388B5DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Supplies</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsCurrent_9C27B90604635CFE4E9E97C27388CCAD_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_9C27B90604635CFE4E9E97C27388CCAD" 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_9C27B90604635CFE4E9E97C27388CCAD_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_9C27B90604635CFE4E9E97C27388CCAD" 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_8DE05D6AEBD9D29C338F97C27388792D_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_8DE05D6AEBD9D29C338F97C27388792D" 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_8DE05D6AEBD9D29C338F97C27388792D_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesReceivable_8DE05D6AEBD9D29C338F97C27388792D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Receivable, Current</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_CAF00C2F13B6C3AE279C97C2738876DC_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_CAF00C2F13B6C3AE279C97C2738876DC" 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_CAF00C2F13B6C3AE279C97C2738876DC_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_CAF00C2F13B6C3AE279C97C2738876DC" 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>
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    <link:label id="lab_us-gaap_AssetsCurrent_4B12C7073BC589EC60FE97C273882964_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_4B12C7073BC589EC60FE97C273882964" 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_4B12C7073BC589EC60FE97C273882964_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_4B12C7073BC589EC60FE97C273882964" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_DB0BE605D102EABC687997C273883B32_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_DB0BE605D102EABC687997C273883B32" 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_DB0BE605D102EABC687997C273883B32_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_DB0BE605D102EABC687997C273883B32" 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_836C965123E63B53441397C27388489C_terseLabel_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_836C965123E63B53441397C27388489C" 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_836C965123E63B53441397C27388489C_label_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_836C965123E63B53441397C27388489C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land and Land Improvements</link:label>
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    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_7CF863A3CA59F9788EBE97C273888CC3_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_7CF863A3CA59F9788EBE97C273888CC3" 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_7CF863A3CA59F9788EBE97C273888CC3_label_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_7CF863A3CA59F9788EBE97C273888CC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Buildings and Improvements, Gross</link:label>
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    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_B92AF0C4A5CC1E59D1CA97C27388516D_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_B92AF0C4A5CC1E59D1CA97C27388516D" 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_B92AF0C4A5CC1E59D1CA97C27388516D_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_B92AF0C4A5CC1E59D1CA97C27388516D" 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_BA6E6465C23734F8BEC197C273885440_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_BA6E6465C23734F8BEC197C273885440" 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_BA6E6465C23734F8BEC197C273885440_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_BA6E6465C23734F8BEC197C273885440" 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_256020646F529A1F8D2397C273887FB3_terseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_256020646F529A1F8D2397C273887FB3" 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_256020646F529A1F8D2397C273887FB3_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_256020646F529A1F8D2397C273887FB3" 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_8BEDC4520C389804589697C273887F73_terseLabel_en-US" xlink:label="lab_htld_RevenueEquipment_8BEDC4520C389804589697C273887F73" 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_8BEDC4520C389804589697C273887F73_label_en-US" xlink:label="lab_htld_RevenueEquipment_8BEDC4520C389804589697C273887F73" 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_8BEDC4520C389804589697C273887F73_documentation_en-US" xlink:label="lab_htld_RevenueEquipment_8BEDC4520C389804589697C273887F73" 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_CEA1068A2B0F15B2B82D97C27388C554_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_CEA1068A2B0F15B2B82D97C27388C554" 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_CEA1068A2B0F15B2B82D97C27388C554_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_CEA1068A2B0F15B2B82D97C27388C554" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in Progress, Gross</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_24063E1CC6C4FB52718397C27388E997_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_24063E1CC6C4FB52718397C27388E997" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_Assets_2849BBB04890A0D9E69297C2738832EA_label_en-US" xlink:label="lab_us-gaap_Assets_2849BBB04890A0D9E69297C2738832EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6F9BEDCC5E24355DEED597C273884E99_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6F9BEDCC5E24355DEED597C273884E99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND STOCKHOLDERS' EQUITY</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6F9BEDCC5E24355DEED597C273884E99_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_6F9BEDCC5E24355DEED597C273884E99" 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_691C2CAD20573536BBE797C273887D7B_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_691C2CAD20573536BBE797C273887D7B" 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_691C2CAD20573536BBE797C273887D7B_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_691C2CAD20573536BBE797C273887D7B" 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_2A6F70E7CC219D98C10F97C27388E797_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_2A6F70E7CC219D98C10F97C27388E797" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable and accrued liabilities</link:label>
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_2A6F70E7CC219D98C10F97C27388E797_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_2A6F70E7CC219D98C10F97C27388E797" 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_EmployeeRelatedLiabilitiesCurrent_C6805766837C4E5D6E2C97C27388443E_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_C6805766837C4E5D6E2C97C27388443E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee-related Liabilities, Current</link:label>
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    <link:label id="lab_us-gaap_AccruedIncomeTaxesNoncurrent_61C3F01534BA5AD2552897C27388CD17_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesNoncurrent_61C3F01534BA5AD2552897C27388CD17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes payable</link:label>
    <link:label id="lab_us-gaap_AccruedIncomeTaxesNoncurrent_61C3F01534BA5AD2552897C27388CD17_label_en-US" xlink:label="lab_us-gaap_AccruedIncomeTaxesNoncurrent_61C3F01534BA5AD2552897C27388CD17" 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_LongTermDebtNoncurrent_6EDB7D8DBD920466ED7D97C273887126_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_6EDB7D8DBD920466ED7D97C273887126" 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_LongTermDebtNoncurrent_6EDB7D8DBD920466ED7D97C273887126_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_6EDB7D8DBD920466ED7D97C273887126" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Excluding Current Maturities</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_E82E693973BF3AE7B8F897C273886D32_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_E82E693973BF3AE7B8F897C273886D32" 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_DeferredTaxLiabilitiesNoncurrent_E82E693973BF3AE7B8F897C273886D32_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_E82E693973BF3AE7B8F897C273886D32" 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_A3819E33D64450960A9697C273880686_label_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveNoncurrent_A3819E33D64450960A9697C273880686" 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_223EEF91A106ACDD50E197C27388D79E_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_223EEF91A106ACDD50E197C27388D79E" 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_223EEF91A106ACDD50E197C27388D79E_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_223EEF91A106ACDD50E197C27388D79E" 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_5BB1726E30D73EE66A9397C273886290_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrent_5BB1726E30D73EE66A9397C273886290" 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_5BB1726E30D73EE66A9397C273886290_label_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrent_5BB1726E30D73EE66A9397C273886290" 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_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">COMMITMENTS AND CONTINGENCIES (Note 14)</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</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_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5" xlink:to="lab_us-gaap_CommitmentsAndContingencies_E7AE3D48C17D45FF77D297C2738816F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_2E3A4B261FF36A7F5B1797C27388E1FD_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_2E3A4B261FF36A7F5B1797C27388E1FD" 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_2E3A4B261FF36A7F5B1797C27388E1FD_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_2E3A4B261FF36A7F5B1797C27388E1FD" 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_A4A567E623E51FE15CED97C273886F07_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockValue_A4A567E623E51FE15CED97C273886F07" 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_A4A567E623E51FE15CED97C273886F07_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_A4A567E623E51FE15CED97C273886F07" 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_CommonStockValue_86E35336F1304F8A0A0897C27388F62D_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_86E35336F1304F8A0A0897C27388F62D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital stock, common, $.01 par value; authorized 395,000 shares; issued 90,689 in 2016 and 2015; outstanding 83,234 and 84,115 in 2016 and 2015, respectively</link:label>
    <link:label id="lab_us-gaap_CommonStockValue_86E35336F1304F8A0A0897C27388F62D_label_en-US" xlink:label="lab_us-gaap_CommonStockValue_86E35336F1304F8A0A0897C27388F62D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Value, Issued</link:label>
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