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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Employee Retirement Plans    
Service cost $ 112 $ 102
Interest cost 432 371
Expected return on plan assets (752) (720)
Net amortization and deferral 208 247
Pension expense $ 0 $ 0