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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
3. 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 as of July 1. The 2012 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, 2012 to June 30, 2013 by reportable segment (in thousands):
 
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 consist of customer relationships acquired from business acquisitions. Intangible assets as of June 30, 2013 and December 31, 2012 were as follows (in thousands):
 
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


The customer relationships intangible assets are amortized over their estimated five to ten years useful lives. Amortization expense was $0.5 million and $0.4 million for the three months ended June 30, 2013 and 2012, respectively, and $1.1 million and $0.8 million for the six months ended June 30, 2013 and 2012, respectively. Estimated amortization expense for each of the next five years based on the intangible assets as of June 30, 2013 is as follows (in thousands):
 
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