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Discontinued Operations: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
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. 30, 2011
Shoppingtown Mall
Mar. 31, 2012
Valley View Mall
Discontinued Operations:                  
Proceeds from sale of a former Mervyn's store     $ 2,300 $ 8,061 $ 3,732        
Gain (loss) from sale of a former Mervyn's store (54,658) (2,237) (200) 3,783 (1,913)        
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
Loss on disposal   (9,101)         3,929    
Revenues from discontinued operations 1,892 5,804              
Loss from discontinued operations $ 58,396 $ 5,088