Employee Benefit Plans - Changes Recognized in OCI (Details) - Defined Benefit Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial gain/(loss)	$ 1,026	$ (75,527)	$ 52,063
Amortization of actuarial loss	4,617	2,861	4,192
Curtailment/Settlement losses	46,793	0	0
Total	$ 52,436	$ (72,666)	$ 56,255