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Property: (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2011
Desert Sky Mall
Feb. 28, 2011
Desert Sky Mall
Mar. 31, 2012
Chandler Village Center, LLC
Investments in unconsolidated joint ventures:          
Write off of development cost     $ 38   $ 1,964
Remeasurement gain on acquisition of additional interest $ 22,990 $ 24,874 $ 1,838    
Ownership percentage in joint ventures     50.00% 100.00%