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Goodwill and Identifiable Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets
Goodwill and Other Identifiable Intangible Assets
 
The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 are as follows (in thousands):
 
 
Apex
 
Oxford
 
Total
Balance as of December 31, 2015
$
644,617

 
$
230,289

 
$
874,906

Translation adjustment

 
(1,393
)
 
(1,393
)
Balance as of December 31, 2016
$
644,617

 
$
228,896

 
$
873,513

Stratacuity acquisition
17,467

 

 
17,467

Translation adjustment


 
3,115

 
3,115

Balance as of December 31, 2017
$
662,084

 
$
232,011

 
$
894,095


As of December 31, 2017 and 2016, the Company had the following acquired intangible assets (in thousands):
 
 
 
 
2017
 
2016
 
 
Estimated Useful Life
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
 
2 - 10 years
 
$
202,588

 
$
119,272

 
$
83,316

 
$
196,204

 
$
98,804

 
$
97,400

Contractor relationships
 
2 - 5 years
 
71,121

 
59,174

 
11,947

 
69,721

 
50,528

 
19,193

Non-compete agreements
 
2 - 7 years
 
11,850

 
6,600

 
5,250

 
10,861

 
4,922

 
5,939

In-use software
 
6 years
 
18,900

 
12,816

 
6,084

 
18,900

 
9,666

 
9,234

Favorable contracts
 
5 years
 
900

 
673

 
227

 
900

 
453

 
447

 
 
 
 
305,359

 
198,535

 
106,824

 
296,586

 
164,373

 
132,213

Not subject to amortization:
 
 
 
 
 
 

 
 

 
 

 
 

 
 

Trademarks
 
 
 
245,942

 

 
245,942

 
245,517

 

 
245,517

Total
 
 
 
$
551,301

 
$
198,535

 
$
352,766

 
$
542,103

 
$
164,373

 
$
377,730



Amortization expense for intangible assets with finite lives was $33.4 million in 2017, $39.6 million in 2016 and $34.5 million in 2015. Estimated amortization for each of the next five years and thereafter follows (in thousands):
 
2018
$
30,322

2019
23,287

2020
15,613

2021
12,753

2022
8,044

Thereafter
16,805

 
$
106,824