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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Retirement Benefits [Abstract]    
Service cost $ 179 $ 253
Interest cost on projected benefit obligation 639 782
Expected return on plan assets (1,255) (1,181)
Net amortization and deferral 705 720
Net periodic pension cost 268 574
Defined Benefit Plan, Non-service cost $ 100 $ 300