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Mortgage Loans Payable And Secured Revolving Credit Facilities (Schedule Of Mortgage Loan Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Balance, beginning of year $ 586,743,000 [1] $ 548,121,000 [1]
New mortgage borrowings and assumptions 74,605,000 [2] 45,791,000 [2]
Repayments (56,132,000) (7,169,000)
Balance, end of year 605,216,000 586,743,000 [1]
Franklin Village Plaza [Member]
    
Debt Instrument [Line Items]    
New mortgage borrowings and assumptions $ 1,500,000  
[1] Restated to reflect the reclassifications of properties subsequently treated as "held for sale/conveyance".
[2] Includes $1.5 million increase relating to Franklin Village Plaza purchase accounting allocations.