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Goodwill (Tables)
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
 
Goodwill
 
(in thousands)
Balance at January 1, 2017
$
209,418

Additions to goodwill
23,738

Currency translation adjustment
2,181

Balance at June 30, 2017
$
235,337