Risk Management and Use of Derivative Financial Instruments - Information Regarding Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value
Derivative assets, fair value, net	$ 21,734	$ 41,502
Derivative liability, fair value, net	(6,275)	(6,188)
Derivatives Designated as Hedging Instruments | Other assets, net | Foreign currency forward contracts
Derivatives, Fair Value
Derivative assets, fair value, net	19,618	38,735
Derivatives Designated as Hedging Instruments | Other assets, net | Interest rate caps
Derivatives, Fair Value
Derivative assets, fair value, net	236	79
Derivatives Designated as Hedging Instruments | Other assets, net | Interest rate swaps
Derivatives, Fair Value
Derivative assets, fair value, net	60	54
Derivatives Designated as Hedging Instruments | Other assets, net | Foreign currency collars
Derivatives, Fair Value
Derivative assets, fair value, net	0	522
Derivatives Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Interest rate swaps
Derivatives, Fair Value
Derivative liability, fair value, net	(5,014)	(6,011)
Derivatives Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Foreign currency collars
Derivatives, Fair Value
Derivative liability, fair value, net	(1,117)	(4)
Derivatives Not Designated as Hedging Instruments | Other assets, net | Foreign currency forward contracts
Derivatives, Fair Value
Derivative assets, fair value, net	71	0
Derivatives Not Designated as Hedging Instruments | Other assets, net | Stock warrants
Derivatives, Fair Value
Derivative assets, fair value, net	1,749	1,848
Derivatives Not Designated as Hedging Instruments | Other assets, net | Swaption
Derivatives, Fair Value
Derivative assets, fair value, net	0	264
Derivatives Not Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Interest rate swaps
Derivatives, Fair Value
Derivative liability, fair value, net	$ (144)	$ (173)