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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Retirement Benefits [Abstract]        
Service cost $ 179 $ 253 $ 358 $ 506
Interest cost on projected benefit obligation 639 782 1,278 1,564
Expected return on plan assets (1,255) (1,181) (2,510) (2,362)
Net amortization and deferral 705 720 1,410 1,440
Net periodic pension cost 268 574 536 1,148
Defined Benefit Plan, Non-service cost $ 100 $ 300 $ 200 $ 600