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Employee Benefit Plans - Components of Periodic Pension Costs and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]    
Interest cost $ 438 $ 465
Expected return on plan assets (661) (665)
Amortization of prior service benefit and net loss 239 220
Net periodic pension benefit 16 20
Amortization of prior service benefit and net loss (239) (220)
Net loss 588 671
Total recognized in other comprehensive loss 349 451
Total recognized in net periodic benefit and other comprehensive loss $ 365 $ 471