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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Goodwill, Gross      
Balance, beginning of period $ 60,447    
Foreign currency fluctuations (248)    
Balance, end of period 60,199   $ 60,447
Accumulated Impairment Losses      
Balance, beginning of period (43,644)    
Foreign currency fluctuations 596    
Balance, end of period (43,048)   (43,644)
Goodwill, Net      
Balance, beginning of period 16,803    
Foreign currency fluctuations 348    
Balance, end of period 17,151   16,803
Acquired Finite-lived Intangible Assets      
Original cost 11,682   30,236
Accumulated amortization (8,577)   (27,041)
Intangible Assets, Net 3,105   3,195
Amortization expense 112 $ 520  
Estimated aggregate amortization expense of Intangible Assets      
Remaining 2016 299    
2017 317    
2018 312    
2019 312    
2020 312    
Thereafter 1,553    
Total 3,105    
Customer Lists and Service Contracts      
Acquired Finite-lived Intangible Assets      
Original cost 6,439   19,781
Accumulated amortization (5,916)   (19,232)
Intangible Assets, Net $ 523   $ 549
Weighted-average original life 15 years   15 years
Trade Name      
Acquired Finite-lived Intangible Assets      
Original cost     $ 3,859
Accumulated amortization     (3,859)
Intangible Assets, Net     $ 0
Weighted-average original life     14 years
Technology      
Acquired Finite-lived Intangible Assets      
Original cost $ 5,243   $ 6,596
Accumulated amortization (2,661)   (3,950)
Intangible Assets, Net $ 2,582   $ 2,646
Weighted-average original life 13 years   13 years