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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Changes in the carrying amount of goodwill    
Balance at the beginning of the period, Goodwill gross $ 151,181  
Goodwill adjustments related to acquisitions 12,626  
Effect of foreign currency translation 1,139  
Balance at the end of the period, Goodwill gross 164,946 $ 151,181
Balance at the beginning of the period, Accumulated impairment losses (76,417)  
Balance at the end of the period, Accumulated impairment losses (76,417) (76,417)
Balance at the beginning of the period, Goodwill, net 74,764  
Balance at the end of the period, Goodwill, net 88,529 74,764
Intangible assets impairment losses $ 523 $ 0