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Employee Benefit Plans - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 356 $ 336 $ 791 $ 725
Medical plans 519 497 969 924
401k match and profit sharing 444 338 943 644
Periodic pension cost 482 343 898 807
Other 3 5 7 28
Total employee benefits $ 1,804 $ 1,519 $ 3,608 $ 3,128