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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of employee benefits charged to operating expenses      
Payroll taxes $ 1,122 $ 1,102 $ 1,081
Medical plans 1,881 1,928 1,974
401(k) match 346 325 310
Pension plan 1,227 1,391 960
Profit-sharing 479 563 201
Other 172 164 122
Total employee benefits $ 5,227 $ 5,473 $ 4,648