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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Goodwill, Gross      
Balance, beginning of period $ 58,397    
Additions 19    
Foreign currency fluctuations 986    
Balance, end of period 59,402   $ 58,397
Accumulated Impairment Losses      
Balance, beginning of period (37,332)    
Foreign currency fluctuations (614)    
Balance, end of period (37,946)   (37,332)
Goodwill, Net      
Balance, beginning of period 21,065    
Additions 19    
Foreign currency fluctuations 372    
Balance, end of period 21,456   21,065
Acquired Finite-lived Intangible Assets      
Original cost 17,879   15,152
Accumulated amortization (9,110)   (8,692)
Intangible Assets, Net 8,769   6,460
Purchase of Intangible Assets $ 2,500 $ 0  
Finite-Lived Intangible Asset, Useful Life 5 years    
Amortization expense $ 244 $ 112  
Estimated aggregate amortization expense of Intangible Assets      
Remaining 2017 813    
2018 1,083    
2019 1,083    
2020 1,083    
2021 1,083    
Thereafter 3,624    
Total 8,769    
Customer Lists      
Acquired Finite-lived Intangible Assets      
Original cost 10,722   8,016
Accumulated amortization (6,192)   (5,948)
Intangible Assets, Net $ 4,530   $ 2,068
Weighted-average original life 10 years   15 years
Trade Name      
Acquired Finite-lived Intangible Assets      
Original cost $ 2,000   $ 2,000
Accumulated amortization (89)   0
Intangible Assets, Net $ 1,911   $ 2,000
Weighted-average original life 15 years   15 years
Technology      
Acquired Finite-lived Intangible Assets      
Original cost $ 5,157   $ 5,136
Accumulated amortization (2,829)   (2,744)
Intangible Assets, Net $ 2,328   $ 2,392
Weighted-average original life 13 years   13 years