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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 9 Months Ended
Sep. 30, 2013
property
Dec. 31, 2012
Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Minimum [Member]
Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Maximum [Member]
Sep. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Weighted Average [Member]
Sep. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
property
Sep. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Minimum [Member]
Sep. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Maximum [Member]
Sep. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Weighted Average [Member]
Sep. 30, 2013
Land Development Property [Member]
Discounted Cash Flow Valuation Technique [Member]
Sep. 30, 2013
Land Development Property [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Land [Member]
Fair Value, Inputs, Level 3 [Member]
item
Fair Value Inputs, Assets, Quantitative Information [Line Items]                            
Real estate held for sale/conveyance $ 66,079,000 $ 77,793,000 $ 65,535,000 $ 62,219,000       $ 53,473,000         $ 10,477,000 $ 1,585,000
Capitalization rates                 7.80% 11.00% 8.80% 7.30%    
Discount rates                 9.20% 12.80% 9.90% 7.80%    
Price per acre         25,000 154,000 49,000              
Number of parcels of land                           3
Number of properties 67             6