Risk Management and Use of Derivative Financial Instruments - Derivative Gain Loss Reclassified From OCI (Details) - Derivatives in Cash Flow Hedging Relationships - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income	$ 3,545	$ 3,455
Foreign currency forward contracts | Other gains and (losses)
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income	2,799	2,434
Foreign currency collars | Other gains and (losses)
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income	984	1,088
Interest rate swaps and caps | Interest expense
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income
Amount of Gain on Derivatives Reclassified from Other Comprehensive (Loss) Income	$ (238)	$ (67)