Risk Management and Use of Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value
Derivative asset fair value	$ 3,664	$ 0
Derivative liability, fair value	(2,501)	(219)
Foreign currency forwards \| Designated as Hedging Instrument \| Other assets
Derivatives, Fair Value
Derivative asset fair value	3,664	0
Interest rate swap \| Designated as Hedging Instrument \| Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ (2,501)	$ (219)

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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