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Fair Value Measurements (Quantitative Information Regarding Level 3 Assets Measured At Fair Value On Non-recurring Basis) (Details) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
property
Dec. 31, 2012
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Minimum [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Maximum [Member]
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Weighted Average [Member]
Mar. 31, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
property
Mar. 31, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Minimum [Member]
Mar. 31, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Maximum [Member]
Mar. 31, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Weighted Average [Member]
Mar. 31, 2013
Land Development Property [Member]
Discounted Cash Flow Valuation Technique [Member]
Mar. 31, 2013
Land Development Property [Member]
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2013
Land [Member]
Fair Value, Inputs, Level 3 [Member]
item
Fair Value Inputs, Assets, Quantitative Information [Line Items]                            
Real estate held for sale/conveyance $ 76,828,000 $ 77,793,000 $ 63,838,000 $ 62,219,000       $ 52,103,000         $ 10,145,000 $ 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