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Goodwill and Intangible Assets, Net, Carrying Amount of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill        
Balance at the beginning of the period     $ 124,479  
Acquisitions     10,066  
Reclassifications     (189)  
Foreign exchange     2,957  
Balance at the end of the period $ 137,313 $ 126,845 137,313 $ 126,845
Intangible Assets        
Balance at the beginning of the period     22,864  
Acquisitions     10,351  
Reclassifications     626  
Amortization (1,500) (1,500) (4,725) (4,600)
Foreign exchange     934  
Balance at the end of the period $ 30,050 $ 24,629 $ 30,050 $ 24,629