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Retirement Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in projected benefit obligation:      
Benefit obligation at beginning of year $ 2,619 $ 2,883  
Service cost 0 0 $ 0
Interest cost 61 64 39
Actuarial loss (gain) 1,097 (157)  
Effect of foreign currency rate changes (242) (171)  
Benefit obligation at end of year 3,535 2,619 2,883
Change in plan assets:      
Fair value at beginning of year 2,705 2,679  
Actual return on plan assets 70 59  
Employer contribution 119 122  
Effect of foreign currency rate changes (91) (155)  
Fair value at end of year 2,803 2,705 $ 2,679
Funded status (732) 86  
Amounts recognized in the balance sheet consist of:      
Prepaid pension costs 331 310  
Accrued pension liabilities (1,063) (224)  
Net amount recognized $ (732) $ 86