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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of employee benefits charged to operating expenses      
Payroll taxes $ 1,167 $ 1,122 $ 1,102
Medical plans 2,026 1,881 1,928
Pension plan 1,403 1,227 1,391
401(k) match 365 346 325
Profit-sharing 508 479 563
Other 82 172 164
Total employee benefits $ 5,551 $ 5,227 $ 5,473