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Employee Retirement Plans - Schedule of components of net periodic pension cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Employee Retirement Plans        
Service cost $ 102 $ 115 $ 204 $ 230
Interest cost 371 506 742 1,006
Expected return on plan assets (720) (698) (1,440) (1,388)
Net amortization and deferral 247 196 494 382
Pension expense $ 0 $ 119 $ 0 $ 230