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Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Net Periodic Pension Cost      
Service cost—benefits earned during the period $ 0 $ 463 $ 2,601
Interest cost on projected benefit obligation 4,100 4,296 4,425
Expected return on plan assets (6,313) (5,780) (7,180)
Amortization of prior service credit 0 (11) (138)
Recognized net actuarial loss 1,866 2,345 2,028
Curtailment gain 0 (1,017) 0
Net Periodic Pension Expense (347) 296 1,736
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income (Loss)      
Net actuarial (gain) loss 3,678 (6,018) 5,678
Recognized net actuarial loss (1,866) (2,345) (2,028)
Recognized prior service credit 0 1,029 138
Total (Before Tax Effects) 1,812 (7,334) 3,788
Total Recognized in Net Benefit Cost and Other Comprehensive (Loss)/Income (Before Tax Effects) $ 1,465 $ (7,038) $ 5,524