Risk Management and Use of Derivative Financial Instruments - Information Regarding Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value
Asset Derivatives Fair Value at	$ 58,418	$ 50,320
Liability Derivatives Fair Value at	(2,996)	(7,374)
Designated as Hedging Instrument | Foreign currency forward contracts | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	37,040	38,975
Designated as Hedging Instrument | Foreign currency collars | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	17,382	7,718
Designated as Hedging Instrument | Interest rate swap | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	190	0
Designated as Hedging Instrument | Interest rate swap | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Liability Derivatives Fair Value at	(2,996)	(4,762)
Designated as Hedging Instrument | Interest rate cap | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	45	0
Not Designated as Hedging Instrument | Interest rate swap | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	9	9
Not Designated as Hedging Instrument | Interest rate swap | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Liability Derivatives Fair Value at	0	(2,612)
Not Designated as Hedging Instrument | Stock warrants | Other assets
Derivatives, Fair Value
Asset Derivatives Fair Value at	$ 3,752	$ 3,618