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Employee Benefit Plans - Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of employee benefits charged to operating expenses      
Payroll taxes $ 1,273 $ 1,112 $ 1,156
Medical plans 1,854 1,826 2,109
401k match and profit sharing 1,586 1,290 956
Periodic pension cost 1,614 1,430 1,707
Other 59 63 67
Total employee benefits $ 6,386 $ 5,721 $ 5,995