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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Goodwill, Gross          
Balance, beginning of period     $ 60,447    
Foreign currency fluctuations     (3,027)    
Balance, end of period $ 57,420   57,420   $ 60,447
Accumulated Impairment Losses          
Balance, beginning of period     (43,644)    
Foreign currency fluctuations     3,748    
Balance, end of period (39,896)   (39,896)   (43,644)
Goodwill, Net          
Balance, beginning of period     16,803    
Foreign currency fluctuations     721    
Balance, end of period 17,524   17,524   16,803
Acquired Finite-lived Intangible Assets          
Original cost 11,751   11,751   30,236
Accumulated amortization (8,772)   (8,772)   (27,041)
Intangible Assets, Net 2,979   2,979   3,195
Amortization expense 112 $ 516 224 $ 1,036  
Estimated aggregate amortization expense of Intangible Assets          
Remaining 2016 185   185    
2017 316   316    
2018 310   310    
2019 310   310    
2020 310   310    
Thereafter 1,548   1,548    
Total 2,979   2,979    
Customer Lists and Service Contracts          
Acquired Finite-lived Intangible Assets          
Original cost 6,550   6,550   19,781
Accumulated amortization (6,090)   (6,090)   (19,232)
Intangible Assets, Net 460   $ 460   $ 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 5,201   $ 5,201   $ 6,596
Accumulated amortization (2,682)   (2,682)   (3,950)
Intangible Assets, Net $ 2,519   $ 2,519   $ 2,646
Weighted-average original life     13 years   13 years