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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets                    
Goodwill, Purchase Accounting Adjustments, net     $ (1,865)              
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year               $ 5,635    
Goodwill, Gross                    
Balance, beginning of period     58,397 $ 60,447 $ 60,447 $ 64,858        
Additions     143,642   3,787          
Foreign currency fluctuations     19,632   (5,837) (4,411)        
Balance, end of period $ 219,806   219,806   58,397 60,447 $ 64,858      
Accumulated Impairment Losses                    
Balance, beginning of period     (37,332) (43,644) (43,644) (46,503)        
Foreign currency fluctuations     3,426   (6,312) 2,859        
Balance, end of period (40,758)   (40,758)   (37,332) (43,644) (46,503)      
Goodwill, Net                    
Goodwill 179,048   179,048   21,065 16,803 18,355 179,048 $ 21,065 $ 16,803
Additions     143,642   3,787          
Foreign currency fluctuations     16,206   475 (1,552)        
Balance, end of period 179,048   179,048   21,065 16,803 18,355      
Acquired Finite-lived Intangible Assets                    
Original cost               193,522 15,152 30,236
Accumulated amortization               (17,770) (8,692) (27,041)
Intangible Assets, Net               175,752 6,460 3,195
Impairment loss recorded on intangible assets           10,577        
Amortization expense $ 7,650 $ 99 11,430 $ 323 $ 409 $ 1,481 $ 2,369      
Estimated aggregate amortization expense of Intangible Assets                    
2017                 558  
2018               22,042 553  
2019               21,398 553  
2020               19,928 553  
2021               18,315 553  
Thereafter               88,434 3,690  
Total               175,752 6,460  
Goodwill, Purchase Accounting Adjustments     $ (1,865)              
Customer Lists                    
Acquired Finite-lived Intangible Assets                    
Original cost               147,582 8,016 19,781
Accumulated amortization               (13,492) (5,948) (19,232)
Intangible Assets, Net               134,090 2,068 549
Weighted-average original life (in years)     15 years   15 years 15 years        
Trade Names                    
Acquired Finite-lived Intangible Assets                    
Original cost               31,515 2,000 3,859
Accumulated amortization               (1,631) 0 (3,859)
Intangible Assets, Net               29,884 2,000 0
Weighted-average original life (in years)     10 years   15 years 14 years        
Technology                    
Acquired Finite-lived Intangible Assets                    
Original cost               14,425 5,136 6,596
Accumulated amortization               (2,647) (2,744) (3,950)
Intangible Assets, Net               $ 11,778 $ 2,392 $ 2,646
Weighted-average original life (in years)     11 years   13 years 13 years