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Debt (Derivative Financial Instruments) (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Derivative [Line Items]    
Mortgage loans payable subject to interest rate swaps $ 31,761,000 $ 32,091,000
Liabilities related to the fair value of interest swaps of mortgage loans payable $ 1,925,000 $ 2,053,000
Minimum [Member]
   
Derivative [Line Items]    
Fixed annual interest rate 5.20%  
Maximum [Member]
   
Derivative [Line Items]    
Fixed annual interest rate 6.50%