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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2013
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, 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 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


The customer relationships intangible assets are amortized over their estimated five to ten year useful lives. Amortization expense was $3.0 million, $1.7 million, and $0.7 million for the years ended December 31, 2013, 2012 and 2011, respectively. 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