Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

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, 2010 to December 31, 2012 by reportable segment (in thousands):

	LTL		TL		TMS		Total
Goodwill balance as of December 31, 2010	$	185,406	$	25,776	$	35,706	$	246,888
Acquisition of Morgan Southern	—		15,019		—		15,019
Acquisition of Bruenger	—		4,182		—		4,182
Acquisition of James Brooks	—		7,944		—		7,944
Acquisition of Prime	—		90,654		—		90,654
Goodwill balance as of December 31, 2011	185,406		143,575		35,706		364,687
Acquisition of CTL	—		—		6,434		6,434
Acquisition of D&E	—		8,211		—		8,211
Acquisition of CTW	—		9,223		—		9,223
Acquisition of R&M	—		20,164		—		20,164
Acquisition of EFS	12,050		—		—		12,050
Acquisition of Central Cal	—		6,688		—		6,688
Acquisition of A&A	—		12,361		—		12,361
Acquisition of DCT	—		2,325		—		2,325
Goodwill balance as of December 31, 2012	$	197,456	$	202,547	$	42,140	$	442,143

Intangible assets

Intangible assets consist of customer relationships acquired from business acquisitions. Intangible assets as of December 31, 2012 and 2011 were as follows (in thousands):

	2012							2011
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
TL	$	15,115	$	(3,430	)	$	11,685	$	11,700	$	(2,005	)	$	9,695
LTL	1,358		(497		)	861		800		(320		)	480
TMS	626		(462		)	164		546		(340		)	206
Total customer relationships	$	17,099	$	(4,389	)	$	12,710	$	13,046	$	(2,665	)	$	10,381

Estimated amortization expense

Estimated amortization expense for each of the next five years based on the intangible assets at December 31, 2012 is as follows (in thousands):

	Amount
Year Ending:
2013	$	2,007
2014	1,985
2015	1,788
2016	1,697
2017	1,576
Thereafter	3,657
Total	$	12,710