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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 288 $ 336 $ 644 $ 632
Medical plans 468 487 894 999
401k match and profit sharing 226 203 476 384
Pension plan 351 306 703 613
Other 9 46 25 62
Total employee benefits $ 1,342 $ 1,378 $ 2,742 $ 2,690