Risk Management and Use of Derivative Financial Instruments - Information Regarding Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value
Derivative asset fair value	$ 4,341	$ 7,180
Derivative liability, fair value	(2,738)	(1,184)
Designated as Hedging Instrument | Other assets, net | Foreign currency forward contracts
Derivatives, Fair Value
Derivative asset fair value	3,763	5,502
Designated as Hedging Instrument | Other assets, net | Interest rate swaps
Derivatives, Fair Value
Derivative asset fair value	336	393
Designated as Hedging Instrument | Other assets, net | Foreign currency collars
Derivatives, Fair Value
Derivative asset fair value	239	1,284
Designated as Hedging Instrument | Other assets, net | Interest rate caps
Derivatives, Fair Value
Derivative asset fair value	3	1
Designated as Hedging Instrument | Accounts payable, accrued expenses and other liabilities | Interest rate swaps
Derivatives, Fair Value
Derivative liability, fair value	(1,138)	(1,151)
Designated as Hedging Instrument | Accounts payable, accrued expenses and other liabilities | Foreign currency collars
Derivatives, Fair Value
Derivative liability, fair value	$ (1,600)	$ (33)