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Fair Value Measurements (Quantitative Information Regarding Level 3 Assets Measured At Fair Value On Non-recurring Basis) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
property
Dec. 31, 2011
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Operating retail real estate [Member]
Fair Value, Inputs, Level 3 [Member]
property
Dec. 31, 2012
Operating retail real estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Minimum [Member]
Dec. 31, 2012
Operating retail real estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Maximum [Member]
Dec. 31, 2012
Operating retail real estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Weighted Average [Member]
Dec. 31, 2012
Land Development Property [Member]
Discounted Cash Flow Valuation Technique [Member]
Dec. 31, 2012
Land Development Property [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Land [Member]
Fair Value, Inputs, Level 3 [Member]
item
Dec. 31, 2012
Land [Member]
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Minimum [Member]
Dec. 31, 2012
Land [Member]
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Maximum [Member]
Dec. 31, 2012
Land [Member]
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]                            
Real estate held for sale/conveyance $ 77,793,000 $ 206,674,000 [1] $ 62,219,000 $ 82,520,000 $ 51,042,000         $ 9,587,000 $ 1,590,000      
Capitalization rates           7.80% 12.00% 8.90% 7.30%          
Discount rates           9.20% 12.80% 10.00% 7.80%          
Price per acre                       25,000 156,000 49,000
Number of parcels of land                     3      
Number of properties 67       7                  
[1] Excludes $5.0 million relating to properties subsequently treated as "held for sale/conveyance".