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Pension Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 60 $ 68 $ 180 $ 203
Interest cost on projected benefit obligation 849 866 2,546 2,599
Expected return on plan assets (1,424) (1,496) (4,273) (4,489)
Net amortization and deferral 808 410 2,425 1,230
Net periodic pension (income) cost $ 293 $ (152) $ 878 $ (457)