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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]        
Benefits earned during the period $ 409 $ 411 $ 1,228 $ 1,232
Interest cost on projected benefit obligation 612 674 1,837 2,021
Expected return on plan assets (607) (593) (1,822) (1,777)
Net amortization and deferral 419 445 1,257 1,335
Net pension expense $ 833 $ 937 $ 2,500 $ 2,811