Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 432,365	$ 432,759
Marketable securities	8,285us-gaap_MarketableSecuritiesCurrent	8,285us-gaap_MarketableSecuritiesCurrent
Trade accounts receivable, net	690,515us-gaap_AccountsReceivableNetCurrent	649,086us-gaap_AccountsReceivableNetCurrent
Other accounts receivable	51,752us-gaap_OtherReceivables	70,305us-gaap_OtherReceivables
Operating supplies, at lower of average cost or market	21,681us-gaap_Supplies	23,664us-gaap_Supplies
Prepaid expenses and other current assets	74,903	63,344
Deferred income taxes	13,901	13,957
Total Current Assets	1,293,402us-gaap_AssetsCurrent	1,261,400us-gaap_AssetsCurrent
Land	192,490us-gaap_Land	192,490us-gaap_Land
Buildings and leasehold improvements	857,767us-gaap_BuildingsAndImprovementsGross	856,037us-gaap_BuildingsAndImprovementsGross
Revenue equipment	1,921,101us-gaap_MachineryAndEquipmentGross	1,902,358us-gaap_MachineryAndEquipmentGross
Other equipment	356,580us-gaap_PropertyPlantAndEquipmentOther	362,341us-gaap_PropertyPlantAndEquipmentOther
Property, plant and equipment, gross	3,327,938us-gaap_PropertyPlantAndEquipmentGross	3,313,226us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(1,681,521)	(1,659,015)
Net Property, Plant and Equipment	1,646,417us-gaap_PropertyPlantAndEquipmentNet	1,654,211us-gaap_PropertyPlantAndEquipmentNet
Deferred charges and other assets	32,245us-gaap_OtherAssetsNoncurrent	31,826us-gaap_OtherAssetsNoncurrent
Capitalized software, net	28,485us-gaap_CapitalizedComputerSoftwareNet	26,208us-gaap_CapitalizedComputerSoftwareNet
Employee benefits	18,392	18,110
Intangible assets, net	5,695	6,284
Goodwill	337,336us-gaap_Goodwill	337,579us-gaap_Goodwill
Total Noncurrent Assets	422,153us-gaap_AssetsNoncurrent	420,007us-gaap_AssetsNoncurrent
Total Assets	3,361,972us-gaap_Assets	3,335,618us-gaap_Assets
Accounts payable	405,471us-gaap_AccountsPayableCurrent	349,995us-gaap_AccountsPayableCurrent
Accrued liabilities	250,512us-gaap_AccruedLiabilitiesCurrent	257,943us-gaap_AccruedLiabilitiesCurrent
Federal and other income taxes	966us-gaap_AccruedIncomeTaxesCurrent	0us-gaap_AccruedIncomeTaxesCurrent
Self-insurance accruals	111,961us-gaap_SelfInsuranceReserveCurrent	117,783us-gaap_SelfInsuranceReserveCurrent
Short-term borrowings	1,862us-gaap_ShortTermBorrowings	1,736us-gaap_ShortTermBorrowings
Current maturities of capital leases	13,298	14,663
Total Current Liabilities	784,070us-gaap_LiabilitiesCurrent	742,120us-gaap_LiabilitiesCurrent
Long-term debt	719,342us-gaap_LongTermDebtNoncurrent	719,303us-gaap_LongTermDebtNoncurrent
Long-term obligations under capital leases	9,765	10,587
Self-insurance accruals	147,381us-gaap_SelfInsuranceReserveNoncurrent	151,257us-gaap_SelfInsuranceReserveNoncurrent
Employee benefits	231,363	239,368
Other liabilities and deferred credits	33,235us-gaap_OtherLiabilitiesNoncurrent	34,356us-gaap_OtherLiabilitiesNoncurrent
Deferred income taxes	244,527	242,789
Total Liabilities	2,169,683us-gaap_Liabilities	2,139,780us-gaap_Liabilities
Commitments and Contingencies (Note 9)
Common stock ($0.625 par value; authorized 100,000,000 shares; issued 66,303,416 and 65,782,041 shares, respectively)	41,427us-gaap_CommonStockValue	41,101us-gaap_CommonStockValue
Additional paid in capital, common stock	715,594	706,756
Retained earnings	1,164,938	1,151,791
Cost of repurchased stock (8,673,724 and 8,112,141 shares, respectively)	(374,138)us-gaap_TreasuryStockValue	(349,401)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss	(355,532)	(354,409)
Total Stockholders' Equity	1,192,289us-gaap_StockholdersEquity	1,195,838us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity	$ 3,361,972	$ 3,335,618

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