Risk Management and Use of Derivative Financial Instruments - Derivative Gain Loss Recognized in OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	$ 13,297	$ 2,893
Derivatives in Cash Flow Hedging Relationships | Equity method investments
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	(400)	(900)
Derivatives in Cash Flow Hedging Relationships | Foreign currency collars
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	17,816	3,616
Derivatives in Cash Flow Hedging Relationships | Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	(2,329)	1,119
Derivatives in Cash Flow Hedging Relationships | Interest rate swaps
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	(2,237)	(1,815)
Derivatives in Cash Flow Hedging Relationships | Interest rate caps
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	2	(27)
Derivatives in Net Investment Hedging Relationships | Foreign currency collars
Derivative Instruments, Gain (Loss)
Amount of Gain Recognized on Derivatives in Other Comprehensive (Loss) Income	$ 45	$ 0