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Employee Benefit Plans - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Summary of employee benefits charged to operating expenses    
Payroll taxes $ 435 $ 389
Medical plans 450 427
401k match and profit sharing 499 306
Periodic pension cost 416 464
Other 4 23
Total employee benefits $ 1,804 $ 1,609