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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets    
Cash and cash equivalents $ 432,759us-gaap_CashAndCashEquivalentsAtCarryingValue $ 484,502us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 8,285us-gaap_MarketableSecurities 0us-gaap_MarketableSecurities
Trade accounts receivable, net 649,086us-gaap_AccountsReceivableNetCurrent 575,013us-gaap_AccountsReceivableNetCurrent
Other accounts receivable 70,305us-gaap_OtherReceivables 51,063us-gaap_OtherReceivables
Operating supplies, at lower of average cost or market 23,664us-gaap_Supplies 23,910us-gaap_Supplies
Prepaid expenses and other current assets 63,344us-gaap_PrepaidExpenseCurrentAndNoncurrent 57,961us-gaap_PrepaidExpenseCurrentAndNoncurrent
Deferred income taxes 13,957us-gaap_DeferredTaxAssetsNetCurrent 15,332us-gaap_DeferredTaxAssetsNetCurrent
Total Current Assets 1,261,400us-gaap_AssetsCurrent 1,207,781us-gaap_AssetsCurrent
Property, Plant and Equipment [Abstract]    
Land 192,490us-gaap_Land 193,364us-gaap_Land
Buildings and leasehold improvements 856,037us-gaap_BuildingsAndImprovementsGross 856,038us-gaap_BuildingsAndImprovementsGross
Revenue equipment 1,902,358us-gaap_MachineryAndEquipmentGross 1,857,737us-gaap_MachineryAndEquipmentGross
Other equipment 362,341us-gaap_PropertyPlantAndEquipmentOther 353,205us-gaap_PropertyPlantAndEquipmentOther
Total Property, Plant and Equipment 3,313,226us-gaap_PropertyPlantAndEquipmentGross 3,260,344us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (1,659,015)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,603,511)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net Property, Plant and Equipment 1,654,211us-gaap_PropertyPlantAndEquipmentNet 1,656,833us-gaap_PropertyPlantAndEquipmentNet
Other Assets    
Deferred charges and other assets 31,826us-gaap_OtherAssetsNoncurrent 32,200us-gaap_OtherAssetsNoncurrent
Capitalized software, net 26,208us-gaap_CapitalizedComputerSoftwareNet 21,488us-gaap_CapitalizedComputerSoftwareNet
Employee benefits 18,110us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 15,018us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Intangible assets, net 6,284us-gaap_IntangibleAssetsNetExcludingGoodwill 8,640us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill 337,579us-gaap_Goodwill 337,971us-gaap_Goodwill
Total Noncurrent Assets 420,007us-gaap_AssetsNoncurrent 415,317us-gaap_AssetsNoncurrent
Total Assets 3,335,618us-gaap_Assets 3,279,931us-gaap_Assets
Liabilities and Shareholders' Equity    
Accounts payable 349,995us-gaap_AccountsPayableCurrent 390,537us-gaap_AccountsPayableCurrent
Accrued liabilities 257,943us-gaap_AccruedLiabilitiesCurrent 229,078us-gaap_AccruedLiabilitiesCurrent
Self-insurance accruals 117,783us-gaap_SelfInsuranceReserveCurrent 105,063us-gaap_SelfInsuranceReserveCurrent
Short-term borrowings 1,736us-gaap_ShortTermBorrowings 1,588us-gaap_ShortTermBorrowings
Current maturities of long-term debt and capital leases 14,663us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 19,685us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total Current Liabilities 742,120us-gaap_LiabilitiesCurrent 745,951us-gaap_LiabilitiesCurrent
Long-Term Liabilities    
Long-term debt 719,303us-gaap_LongTermDebtNoncurrent 719,155us-gaap_LongTermDebtNoncurrent
Long-term obligations under capital leases 10,587us-gaap_CapitalLeaseObligationsNoncurrent 16,185us-gaap_CapitalLeaseObligationsNoncurrent
Self-insurance accruals 151,257us-gaap_SelfInsuranceReserveNoncurrent 142,307us-gaap_SelfInsuranceReserveNoncurrent
Employee benefits 239,368us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent 240,171us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
Other liabilities and deferred credits 34,356us-gaap_OtherLiabilitiesNoncurrent 39,524us-gaap_OtherLiabilitiesNoncurrent
Deferred income taxes 242,789us-gaap_DeferredTaxLiabilitiesNoncurrent 237,949us-gaap_DeferredTaxLiabilitiesNoncurrent
Total Liabilities 2,139,780us-gaap_Liabilities 2,141,242us-gaap_Liabilities
Commitments and Contingencies (Notes 5, 6, 7 and 11)      
Shareholders' Equity    
Common stock, $0.625 par value; authorized 100,000,000 shares; issued 65,782,041 and 64,592,756 shares, respectively 41,101us-gaap_CommonStockValue 40,349us-gaap_CommonStockValue
Additional paid-in capital, common stock 706,756us-gaap_AdditionalPaidInCapitalCommonStock 653,487us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 1,151,791us-gaap_RetainedEarningsAccumulatedDeficit 1,043,472us-gaap_RetainedEarningsAccumulatedDeficit
Cost of repurchased common stock (8,112,141 and 7,669,889 shares, respectively) (349,401)us-gaap_TreasuryStockValue (329,088)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (354,409)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (269,531)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Shareholders' Equity 1,195,838us-gaap_StockholdersEquity 1,138,689us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity $ 3,335,618us-gaap_LiabilitiesAndStockholdersEquity $ 3,279,931us-gaap_LiabilitiesAndStockholdersEquity