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Discontinued Operations: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
May 31, 2012
Mervyn's
Nov. 30, 2011
Mervyn's
Oct. 31, 2011
Mervyn's
Mar. 31, 2011
Mervyn's
Jun. 30, 2011
GGP Exchange
store
Dec. 31, 2011
Shoppingtown Mall
Jun. 29, 2011
Shoppingtown Mall
Apr. 30, 2012
Valley View Mall
Mar. 31, 2012
Valley View Mall
Apr. 30, 2012
The Borgata
squarefoot
May 31, 2012
Hilton Village.
squarefoot
May 31, 2012
Prescott Gateway
squarefoot
Jun. 30, 2012
Carmel Plaza
squarefoot
Discontinued Operations:                                  
Proceeds from sale         $ 20,750 $ 2,300 $ 8,061 $ 3,732           $ 9,150 $ 24,820   $ 52,000
Gain (loss) from sale 130,727 (35,753) 75,159 (37,991) (383) (200) 3,783 (1,913)           (1,275) 3,260   7,884
Number of anchor locations exchanged                 6                
Number of Mervyn's stores exchanged                 5                
Impairment charge                     35,729   54,306        
Long-lived assets written off to fair value                     38,968   33,450        
Gain (loss) on extinguishment of debt   (32)   (9,133)           (3,929)   104,033       16,350  
Property square footage                           93,693 79,814 339,771 111,945
Revenues from discontinued operations 3,920 10,485 10,598 21,277                          
Income (loss) from discontinued operations $ 129,638 $ (40,516) $ 69,710 $ (45,951)