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Employee Benefit Plans - Changes Recognized in OCI (Details) - Pension Plan - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]        
Current year actuarial gain/(loss)   $ 12,205 $ (9,379) $ 1,026
Amortization of actuarial loss   (4,424) (4,406) (4,617)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment $ 1,100 0 0 46,793
Total   $ 16,629 $ (4,973) $ 52,436