Derivative Instruments - Summary of Unrealized Gain (Loss) Recorded In and Reclassified From Accumulated Other Comprehensive Income (Details) - Derivatives designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in Comprehensive Income (Effective Portion)	$ 2,210	$ 2,592
Loss Reclassified from AOCI to Income (Effective Portion)	(297)	(2,687)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in Comprehensive Income (Effective Portion)	6,688	2,592
Interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Loss Reclassified from AOCI to Income (Effective Portion)	(297)	(2,687)
Net investment cross currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain Recognized in Comprehensive Income (Effective Portion)	(4,478)	0
Loss Reclassified from AOCI to Income (Effective Portion)	$ 0	$ 0