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Debt (Mortgage Loans Payable And Derivative Financial Instruments) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Repayment of mortgage loans payable $ 38,000,000  
Prepayments of debt 32,600,000  
Early extinguishment of debt charges 522,000  
Mortgage loans payable subject to interest rate swaps 25,882,000 31,417,000
Liabilities related to the fair value of interest swaps of mortgage loans payable 1,324,000 1,577,000
Minimum [Member]
   
Derivative [Line Items]    
Fixed annual interest rate 5.20%  
Maximum [Member]
   
Derivative [Line Items]    
Fixed annual interest rate 6.50%  
Discontinued Operations [Member]
   
Derivative [Line Items]    
Early extinguishment of debt charges $ 437,000