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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary of employee benefits charged to operating expenses    
Payroll taxes $ 356 $ 296
Medical plans 426 512
401k match and profit sharing 250 181
Pension plan 352 307
Other 16 16
Total employee benefits $ 1,400 $ 1,312