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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill, Gross      
Balance, beginning of period $ 60,447 $ 64,858  
Additions 3,787    
Foreign currency fluctuations (5,837) (4,411)  
Balance, end of period 58,397 60,447 $ 64,858
Accumulated Impairment Losses      
Balance, beginning of period (43,644) (46,503)  
Foreign currency fluctuations (6,312) 2,859  
Balance, end of period (37,332) (43,644) (46,503)
Goodwill, Net      
Balance, beginning of period 16,803 18,355  
Additions 3,787    
Foreign currency fluctuations 475 (1,552)  
Balance, end of period 21,065 16,803 18,355
Acquired Finite-lived Intangible Assets      
Original cost 15,152 30,236  
Accumulated amortization (8,692) (27,041)  
Intangible Assets, Net 6,460 3,195  
Impairment loss recorded on intangible assets   10,577  
Amortization expense 409 1,481 $ 2,369
Estimated aggregate amortization expense of Intangible Assets      
2017 558    
2018 553    
2019 553    
2020 553    
2021 553    
Thereafter 3,690    
Total 6,460    
Customer Lists      
Acquired Finite-lived Intangible Assets      
Original cost 8,016 19,781  
Accumulated amortization (5,948) (19,232)  
Intangible Assets, Net $ 2,068 $ 549  
Weighted-average original life (in years) 15 years 15 years  
Trade Name      
Acquired Finite-lived Intangible Assets      
Original cost $ 2,000 $ 3,859  
Accumulated amortization 0 (3,859)  
Intangible Assets, Net $ 2,000 $ 0  
Weighted-average original life (in years) 15 years 14 years  
Technology      
Acquired Finite-lived Intangible Assets      
Original cost $ 5,136 $ 6,596  
Accumulated amortization (2,744) (3,950)  
Intangible Assets, Net $ 2,392 $ 2,646  
Weighted-average original life (in years) 13 years 13 years