Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of goodwill by reportable segment

	LTL		TL			TMS		Total
Goodwill balance as of December 31, 2012	$	197,456	$	202,547		$	42,140	$	442,143
Adjustments to goodwill for purchase accounting	—		(905		)	—		(905		)
Acquisition	—		4,803			13,767		18,570
Goodwill balance as of June 30, 2013	$	197,456	$	206,445		$	55,907	$	459,808

Intangible assets

	June 30, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
Customer relationships - TL	$	16,950	$	(4,351	)	$	12,599	$	15,115	$	(3,430	)	$	11,685
Customer relationships - LTL	1,358		(610		)	748		1,358		(497		)	861
Customer relationships - TMS	1,533		(506		)	1,027		626		(462		)	164
Total customer relationships	$	19,841	$	(5,467	)	$	14,374	$	17,099	$	(4,389	)	$	12,710

Estimated amortization expense

	Amount
Remainder 2013	$	1,154
2014	2,296
2015	2,099
2016	2,007
2017	1,886
2018	1,622
Thereafter	3,310
Total	$	14,374