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Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Retirement Benefits [Abstract]    
Service cost $ 248 $ 179
Interest cost on projected benefit obligation 451 639
Expected return on plan assets (1,289) (1,255)
Net amortization and deferral 832 705
Net periodic pension cost $ 242 268
Defined Benefit Plan, Non-service cost   $ 100