Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

(Dollars in thousands)	Years ended December 31,
	2013		2012			2011
Revenue from External Customers
Freight	$	3,424,002	$	3,339,605		$	3,196,564
Logistics	1,474,507		1,677,279			1,555,422
Truckload	567,255		558,714			532,165
Corporate and Eliminations	7,592		4,649			5,802
	$	5,473,356	$	5,580,247		$	5,289,953
Revenue from Internal Customers
Freight	$	42,098	$	52,991		$	50,543
Logistics	65,892		48,921			34,572
Truckload	69,555		76,842			82,849
Corporate and Eliminations	70,687		53,015			40,883
	$	248,232	$	231,769		$	208,847
Operating Income (Loss)
Freight	$	146,047	$	143,869		$	119,779
Logistics	23,467		44,616			54,747
Truckload	38,691		44,921			34,813
Corporate and Eliminations	748		(4,565		)	(1,411		)
	$	208,953	$	228,841		$	207,928
Depreciation and Amortization, net of Accretion
Freight	$	135,311	$	124,372		$	109,875
Logistics	7,571		7,532			8,783
Truckload	74,449		69,799			70,003
Corporate and Eliminations	11,905		13,499			12,977
	$	229,236	$	215,202		$	201,638
Capital Expenditures
Freight	$	180,576	$	190,218		$	146,001
Logistics	24,587		7,186			10,055
Truckload	74,637		93,117			131,413
Corporate and Eliminations	2,143		2,614			1,525
	$	281,943	$	293,135		$	288,994
Assets
Freight	$	1,529,681	$	1,459,576		$	1,368,249
Logistics	318,266		302,295			313,253
Truckload	799,775		807,470			791,864
Corporate and Eliminations	632,209		583,074			626,650
	$	3,279,931	$	3,152,415		$	3,100,016

Revenue Classified By Major Geographic Areas

(Dollars in thousands)	Years ended December 31,
	2013		2012		2011
Revenue
United States	$	5,094,193	$	5,189,792	$	4,965,630
Canada	116,491		114,451		110,799
Other	262,672		276,004		213,524
Total	$	5,473,356	$	5,580,247	$	5,289,953