Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of goodwill by reportable segment acquired during business acquisition

The following is a rollforward of goodwill from December 31, 2011 to December 31, 2013 by reportable segment (in thousands):

	LTL			TL			TMS		Total
Goodwill balance as of December 31, 2011	$	185,406		$	143,575		$	35,706	$	364,687
Goodwill related to acquisitions	12,050			58,972			6,434		77,456
Goodwill balance as of December 31, 2012	197,456			202,547			42,140		442,143
Adjustments to goodwill for purchase accounting	(144		)	(1,906		)	4		(2,046		)
Goodwill related to acquisitions	—			10,772			67,874		78,646
Goodwill balance as of December 31, 2013	$	197,312		$	211,413		$	110,018	$	518,743

Intangible assets

Intangible assets consist of customer relationships acquired from business acquisitions. Intangible assets were as follows as of December 31 (in thousands):

	2013							2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
TL	$	17,826	$	(5,294	)	$	12,532	$	15,115	$	(3,430	)	$	11,685
LTL	1,358		(723		)	635		1,358		(497		)	861
TMS	19,522		(1,326		)	18,196		626		(462		)	164
Total customer relationships	$	38,706	$	(7,343	)	$	31,363	$	17,099	$	(4,389	)	$	12,710

Estimated amortization expense

Estimated amortization expense for each of the next five years based on intangible assets as of December 31, 2013 is as follows (in thousands):

	Amount
Year Ending:
2014	$	4,023
2015	3,826
2016	3,735
2017	3,614
2018	3,349
Thereafter	12,816
Total	$	31,363