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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill represents the excess of the purchase price of all acquisitions over the estimated fair value of the net assets acquired. The Company completes an impairment test of goodwill annually. This impairment test did not result in any impairment losses. There is no goodwill impairment for any of the periods presented in our financial statements.
 
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 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


The customer relationships intangible assets are amortized over their estimated five to ten year useful lives. Amortization expense for the years ended December 31, 2012, 2011 and 2010 was $1.7 million, $0.7 million, and $0.6 million, respectively. 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