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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of employee benefits charged to operating expenses    
Payroll taxes $ 351 $ 356
Medical plans 548 426
401k match and profit sharing 186 250
Periodic pension cost 405 336
Other 15 16
Total employee benefits $ 1,505 $ 1,384