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Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Goodwill [Roll Forward]    
Balance at January 1, 2016 $ 340,338 $ 340,338
Disposal $ (200) (198)
Currency translation   (8,001)
Balance at June 30, 2016   $ 332,139