Risk Management and Use of Derivative Financial Instruments - Information Regarding Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value
Derivative assets, fair value	$ 27,268	$ 21,915
Liability derivatives, fair value	(3,331)	(7,913)
Designated as Hedging Instrument | Foreign currency forward contracts | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	15,486	12,737
Designated as Hedging Instrument | Foreign currency collars | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	6,392	4,931
Designated as Hedging Instrument | Foreign currency collars | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Liability derivatives, fair value	(3,167)	(6,805)
Designated as Hedging Instrument | Interest rate swaps | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	1,500	523
Designated as Hedging Instrument | Interest rate swaps | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Liability derivatives, fair value	(164)	(1,108)
Designated as Hedging Instrument | Interest rate cap | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	4	20
Not Designated as Hedging Instrument | Interest rate swaps | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	0	19
Not Designated as Hedging Instrument | Stock warrants | Other assets, net
Derivatives, Fair Value
Derivative assets, fair value	$ 3,886	$ 3,685