Risk Management and Use of Derivative Financial Instruments - Information Regarding Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value
Derivative asset fair value	$ 3,313	$ 3,569
Derivative liability, fair value	(1,239)	(1,266)
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value
Derivative asset fair value	3,313	3,569
Derivative liability, fair value	(1,222)	(1,151)
Derivatives Designated as Hedging Instruments | Accounts receivable and other assets, net | Foreign currency forward contracts
Derivatives, Fair Value
Derivative asset fair value	1,856	2,011
Derivatives Designated as Hedging Instruments | Accounts receivable and other assets, net | Foreign currency collars
Derivatives, Fair Value
Derivative asset fair value	1,024	750
Derivatives Designated as Hedging Instruments | Accounts receivable and other assets, net | Interest rate swaps
Derivatives, Fair Value
Derivative asset fair value	433	808
Derivatives Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Foreign currency collars
Derivatives, Fair Value
Derivative liability, fair value	(180)	(622)
Derivatives Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Interest rate swaps
Derivatives, Fair Value
Derivative liability, fair value	(1,042)	(529)
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value
Derivative asset fair value	0	0
Derivative liability, fair value	(17)	(115)
Derivatives Not Designated as Hedging Instruments | Accounts payable, accrued expenses and other liabilities | Foreign currency collars
Derivatives, Fair Value
Derivative liability, fair value	$ (17)	$ (115)