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Fair Value Measurements (Quantitative Information Regarding Level 3 Assets Measured At Fair Value On Non-recurring Basis) (Details) (USD $)
 9 Months Ended 9 Months Ended
Sep. 30, 2012
property
Dec. 31, 2011
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Minimum [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Maximum [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Weighted Average [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Minimum [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Maximum [Member]
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Weighted Average [Member]
Sep. 30, 2012
Operating retail real estate [Member]
Fair Value, Inputs, Level 3 [Member]
property
Sep. 30, 2012
Land [Member]
Fair Value, Inputs, Level 3 [Member]
item
Fair Value Inputs, Assets, Quantitative Information [Line Items]                        
Real estate held for sale/conveyance $ 194,174,000 $ 206,674,000 [1] $ 71,931,000 $ 82,520,000             $ 62,620,000 $ 9,311,000
Capitalization rates         7.50% 11.30% 9.80%          
Discount rates         11.50% 12.00% 11.60%          
Price per acre               29,000 217,000 118,000    
Number of parcels of land                       6
Number of properties 67                   9  
[1] Excludes $0.9 million relating to a property subsequently treated as "held for sale/conveyance".