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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Employee Retirement Plans        
Service cost $ 102 $ 115 $ 306 $ 345
Interest cost 371 502 1,113 1,508
Expected return on plan assets (720) (693) (2,160) (2,081)
Net amortization and deferral $ 247 191 $ 741 573
Pension expense   $ 115   $ 345