Derivatives - Schedule of Loss (Gain) Derivatives Not Designated as Hedging (Details) - Derivatives Not Designated as Hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest (income) expense | Interest rate swaps
Derivatives [Line Items]
Loss (gain) on derivatives	$ 1,051	$ (1,813)	$ 1,814	$ (4,782)
Loss on foreign currency exchange | Foreign currency forward contracts
Derivatives [Line Items]
Loss (gain) on derivatives	$ (12,934)	$ 14,021	$ (8,487)	$ 32,184