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Employee Benefit Plans - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 310 $ 305 $ 1,101 $ 1,030
Medical plans 436 446 1,405 1,370
401k match and profit sharing 513 490 1,456 1,134
Periodic pension cost 449 404 1,347 1,211
Other 3 14 10 42
Total employee benefits $ 1,711 $ 1,659 $ 5,319 $ 4,787