Risk Management and Use of Derivative Financial Instruments - Derivative Gain Loss Recognized in OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	$ 5,703	$ (9,658)	$ 2,888	$ (13,022)
Equity Method Investments
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	(300)	(400)	200	100
Derivatives in Cash Flow Hedging Relationships \| Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	4,201	(8,729)	(23)	(12,478)
Derivatives in Cash Flow Hedging Relationships \| Interest rate swaps
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	448	44	2,470	1,037
Derivatives in Cash Flow Hedging Relationships \| Foreign currency collars
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	1,042	(945)	486	(1,002)
Derivatives in Cash Flow Hedging Relationships \| Interest rate caps
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	(21)	(105)	(44)	(363)
Derivatives in Net Investment Hedging Relationships \| Foreign currency forward contracts
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	22	84	0	(207)
Derivatives in Net Investment Hedging Relationships \| Foreign currency collars
Derivative Instruments, Gain (Loss)
Derivatives, income (loss) recognized in OCI, effective portion, net	$ 11	$ (7)	$ (1)	$ (9)

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