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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 267 $ 251 $ 911 $ 883
Medical plans 595 415 1,489 1,414
401k match and profit sharing 218 201 694 585
Pension plan 349 307 1,052 920
Other 17 56 42 118
Total employee benefits $ 1,446 $ 1,230 $ 4,188 $ 3,920