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Business Combinations (Narrative) (Details) (USD $)
9 Months Ended0 Months Ended3 Months Ended9 Months Ended0 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Apr. 30, 2011
Apr. 13, 2011
Palm Coast [Member]
Sep. 30, 2011
Palm Coast [Member]
Sep. 30, 2011
Palm Coast [Member]
Apr. 02, 2010
Sheridan [Member]
Sep. 30, 2010
Sheridan [Member]
Sep. 30, 2010
Sheridan [Member]
Apr. 02, 2010
Sheridan [Member]
Minimum [Member]
Apr. 02, 2010
Sheridan [Member]
Maximum [Member]
Business Combination, Separately Recognized Transactions [Line Items]          
Effective date of business combination  April 13, 2011  April 1, 2010    
Ownership percentage in joint ventures47.80%50.00%50.00%  50.00%    
Number of joint ventures in which control was assumed     2    
Discount rate used in business combination  8.00%     8.00%17.00%
Business combination, control obtained description    Effective April 1, 2010, we assumed control of two 50%-owned unconsolidated joint ventures ("Sheridan") related to a development project in Sheridan, Colorado, which resulted in the consolidation of these joint ventures within our shopping center segment that had previously been accounted for under the equity method. Control was assumed through a modification of the joint venture agreements in which we assumed all management, voting and approval rights without transferring consideration to our joint venture partner. Each partner's percentage interest in the joint ventures remained unchanged. Management has determined that these transactions qualified as business combinations to be accounted for under the acquisition method    
Business combination, valuation description         
Gain on Acquisition$ 4,559,000   $ 4,600,000     
Impairment losses related to partially owned real estate joint ventures and partnerships       15,800,000  
Increase in revenue after business combination   900,0001,700,000 700,0001,200,000  
(Increase) decrease in net loss attributable to common shareholders after business combination   $ (1,100,000)$ (800,000) $ 100,000$ (800,000)