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Intangible Assets
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Goodwill
 
Changes in the carrying amount of goodwill by reportable business segment for the nine months ended September 30, 2018 were as follows (in thousands):
 
Workforce Excellence
 
Business Transformation Services
 
Total
Balance as of December 31, 2017
$
105,764

 
$
39,071

 
$
144,835

Acquisitions
21,657

 
10,471

 
32,128

Foreign currency translation
(1,476
)
 
(512
)
 
(1,988
)
Balance as of September 30, 2018
$
125,945


$
49,030


$
174,975


 
Intangible Assets Subject to Amortization
 
Intangible assets with finite lives are subject to amortization over their estimated useful lives. The primary assets included in this category and their respective balances were as follows (in thousands):
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
September 30, 2018
 
 
Customer relationships
$
22,558

 
$
(7,717
)
 
$
14,841

Intellectual property and other
4,301

 
(1,679
)
 
2,622

 
$
26,859


$
(9,396
)

$
17,463

 
 
 
 
 
 
December 31, 2017
 

 
 

 
 

Customer relationships
$
16,330

 
$
(11,140
)
 
$
5,190

Intellectual property and other
4,298

 
(1,125
)
 
3,173

 
$
20,628


$
(12,265
)

$
8,363