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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Retirement Benefits [Abstract]        
Service cost $ 253 $ 169 $ 506 $ 338
Interest cost on projected benefit obligation 782 701 1,564 1,403
Expected return on plan assets (1,181) (1,354) (2,362) (2,709)
Net amortization and deferral 720 672 1,440 1,344
Net periodic pension cost 574 $ 188 1,148 $ 376
Defined Benefit Plan, Non-service cost $ 300   $ 600