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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of employee benefits charged to operating expenses        
Payroll taxes $ 301 $ 288 $ 652 $ 644
Medical plans 612 468 1,160 894
401k match and profit sharing 237 226 423 476
Periodic pension cost 405 335 810 671
Other 10 9 25 25
Total employee benefits $ 1,565 $ 1,326 $ 3,070 $ 2,710