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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Activity in Goodwill
The following table sets forth the activity in goodwill from December 31, 2012, through December 31, 2014 (in thousands):
 
  
Goodwill
Balance as of December 31, 2012
$
201,339

Acquisitions
13

Foreign currency translation adjustments
(519
)
Balance as of December 31, 2013
$
200,833

Acquisitions
—

Foreign currency translation adjustments
(1,345
)
Balance as of December 31, 2014
$
199,488