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Pension Plan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 113 $ 67
Interest cost on projected benefit obligation 719 888
Expected return on plan assets (1,297) (1,469)
Net amortization and deferral 695 812
Net periodic pension cost $ 230 $ 298