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Goodwill and Identifiable Assets
6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets
5. Goodwill and Identifiable Intangible Assets

The changes in the carrying amount of goodwill for the year ended December 31, 2014 and the six months ended June 30, 2015 are as follows (in thousands):
 
Apex Segment
 
Oxford Segment
 
Total
Balance as of December 31, 2013
$
289,712

 
$
224,714

 
$
514,426

Translation adjustment
(1,761
)
 
(605
)
 
(2,366
)
Balance as of December 31, 2014
287,951

 
224,109

 
512,060

Creative Circle Acquisition (see Note 3)
361,746

 

 
361,746

LabResource Acquisition (see Note 3)

 
6,104

 
6,104

Translation adjustment
(1,001
)
 
(47
)
 
(1,048
)
Balance as of June 30, 2015
$
648,696

 
$
230,166

 
$
878,862


 
Acquired intangible assets consisted of the following (in thousands):
 
 
 
As of June 30, 2015
 
As of December 31, 2014
 
Estimated Useful Life
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
2 - 10 years
 
$
197,139

 
$
60,661

 
$
136,478

 
$
101,141

 
$
53,434

 
$
47,707

Contractor relationships
2 - 5 years
 
69,790

 
34,490

 
35,300

 
39,332

 
32,021

 
7,311

Non-compete agreements
2 - 7 years
 
10,911

 
2,305

 
8,606

 
3,654

 
1,922

 
1,732

In-use software
6 years
 
18,900

 
4,941

 
13,959

 
18,900

 
3,366

 
15,534

Favorable contracts(1)
5 years
 
900

 
22

 
878

 

 

 

 
 
 
297,640

 
102,419

 
195,221

 
163,027

 
90,743

 
72,284

Intangible assets not subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
Trademarks
 
 
245,664

 

 
245,664

 
178,325

 

 
178,325

Total
 
 
$
543,304

 
$
102,419

 
$
440,885

 
$
341,352

 
$
90,743

 
$
250,609


 
(1) The favorable contracts intangible asset pertains to operating leases which are amortized as rent expense and included in SG&A expenses in the accompanying condensed consolidated statements of operations and comprehensive income. Expense associated with this favorable contracts intangible asset is not significant.

Amortization expense for intangible assets with finite lives was $7.0 million and $5.5 million for the three months ended June 30, 2015 and 2014, respectively. Amortization expense for intangible assets with finite lives was $11.8 million and $11.1 million for the six months ended June 30, 2015 and 2014, respectively. Estimated amortization for the remainder of this year, each of the next four years and thereafter follows (in thousands): 
2015
$
22,740

2016
39,690

2017
33,058

2018
28,930

2019
22,031

Thereafter
48,772

 
$
195,221


Goodwill and other intangible assets having an indefinite useful life are not amortized for financial statement purposes. Goodwill and intangible assets with indefinite lives are reviewed for impairment on an annual basis as of October 31 and whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. There were no triggering events that required an interim impairment analysis during the current period.