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Risk Management and Use of Derivative Financial Instruments (Details 1) (Designated as hedging, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value    
Derivative assets, fair value, net $ 505 $ 0
Derivative liability, fair value, net (710) (410)
Interest rate swap | Other assets
   
Derivatives, Fair Value    
Derivative assets, fair value, net 505 0
Interest rate swap | Accounts payable, accrued expenses and other liabilities
   
Derivatives, Fair Value    
Derivative liability, fair value, net $ (710) $ (410)