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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 141 $ 409 $ 423 $ 1,228
Interest cost 552 612 1,655 1,837
Expected return on plan assets (576) (607) (1,727) (1,822)
Net amortization and deferral 132 419 395 1,257
Net periodic pension cost $ 249 $ 833 $ 746 $ 2,500