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Mortgage Loans Payable And Secured Revolving Credit Facilities (Schedule Of Principal Payments On Mortgage Loans Payable And Secured Revolving Credit Facilities) (Details) (USD $)
Dec. 31, 2012
Debt Instrument [Line Items]  
2013 $ 119,050,000 [1]
2014 107,786,000
2015 154,766,000 [2]
2016 214,939,000 [3]
2017 63,384,000
Thereafter 101,291,000
Long-term debt 761,216,000
One-Year Extension Option [Member]
 
Debt Instrument [Line Items]  
2013 59,700,000
2015 81,000,000
2016 $ 75,000,000
[1] Includes $59.7 million subject to a one-year extension option.
[2] Includes $81.0 million subject to a one-year extension option.
[3] Includes $75.0 million subject to a one-year extension option.