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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 261 $ 267 $ 913 $ 911
Medical plans 490 595 1,650 1,489
401k match and profit sharing 261 218 684 694
Periodic pension cost 470 336 1,280 1,007
Other 12 17 37 42
Total employee benefits $ 1,494 $ 1,433 $ 4,564 $ 4,143