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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 336 $ 270 $ 632 $ 599
Medical plans 487 463 999 971
401k match and profit sharing 203 223 384 495
Pension plan 306 348 613 696
Other 46 24 62 43
Total employee benefits $ 1,378 $ 1,328 $ 2,690 $ 2,804