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Fair Value Measurements (Quantitative Information Regarding Level 3 Assets Measured At Fair Value On Non-recurring Basis) (Details) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
property
Dec. 31, 2012
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Minimum [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Maximum [Member]
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Sales Comparison Approach Valuation Technique [Member]
Weighted Average [Member]
Jun. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
property
Jun. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Minimum [Member]
Jun. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Maximum [Member]
Jun. 30, 2013
Operating Retail Real Estate [Member]
Fair Value, Inputs, Level 3 [Member]
Discounted Cash Flow Valuation Technique [Member]
Weighted Average [Member]
Jun. 30, 2013
Land Development Property [Member]
Discounted Cash Flow Valuation Technique [Member]
Jun. 30, 2013
Land Development Property [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 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 $ 65,026,000 $ 77,793,000 $ 64,482,000 $ 62,219,000       $ 52,566,000         $ 10,325,000 $ 1,591,000
Capitalization rates                 7.80% 11.00% 8.80% 7.30%    
Discount rates                 9.20% 12.80% 9.90% 7.80%    
Price per acre         25,000 156,000 49,000              
Number of parcels of land                           3
Number of properties 67             6