Risk Management and Use of Derivative Financial Instruments - Derivative Gain Loss Recognized in OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	$ 2,513	$ (3,406)	$ (2,037)
Designated as Cash Flow Hedging Instruments | Interest rate swaps
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	2,046	(1,412)	(2,288)
Designated as Cash Flow Hedging Instruments | Foreign currency collars
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	352	(1,019)	1,343
Designated as Cash Flow Hedging Instruments | Interest rate caps
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	115	(227)	(38)
Designated as Cash Flow Hedging Instruments | Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	0	(861)	(1,096)
Derivatives in Net Investment Hedging Relationship | Foreign currency collars
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	0	113	19
Derivatives in Net Investment Hedging Relationship | Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized on Derivatives in Other Comprehensive Income (Loss)	$ 0	$ 0	$ 23