Risk Management and Use of Derivative Financial Instruments (Details 1) - Designated as hedging - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value
Derivative asset, fair value, net	$ 86	$ 226
Derivative liability, fair value, net	(209)	(716)
Interest rate swaps | Other assets
Derivatives, Fair Value
Derivative asset, fair value, net	0	109
Interest rate swaps | Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Derivative liability, fair value, net	(209)	(716)
Interest rate caps | Other assets
Derivatives, Fair Value
Derivative asset, fair value, net	$ 86	$ 117