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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Components of net periodic pension expense:        
Interest cost $ 542 $ 571 $ 1,084 $ 1,142
Expected return on plan assets (698) (697) (1,396) (1,394)
Amortization of net loss 310 384 620 768
Total net periodic pension expense $ 154 $ 258 $ 308 $ 516