Risk Management and Use of Derivative Financial Instruments (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value
Derivative assets, fair value, net	$ 34,128	$ 43,945
Derivative liability, fair value, net	(13,850)	(10,841)
Foreign currency forward contracts | Designated as hedging | Other assets
Derivatives, Fair Value
Derivative assets, fair value, net	32,198	41,850
Foreign currency collars | Designated as hedging | Other assets
Derivatives, Fair Value
Derivative assets, fair value, net		4
Foreign currency collars | Designated as hedging | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Derivative liability, fair value, net	(519)	(109)
Interest rate swaps | Designated as hedging | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Derivative liability, fair value, net	(13,331)	(10,732)
Stock warrants | Not designated | Other assets
Derivatives, Fair Value
Derivative assets, fair value, net	1,782	1,782
Swaption | Not designated | Other assets
Derivatives, Fair Value
Derivative assets, fair value, net	$ 148	$ 309