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Discontinued Operations: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jul. 31, 2009
Village Center
Jun. 30, 2009
Village Center
Nov. 30, 2011
Mervyn's
Oct. 31, 2011
Mervyn's
Mar. 31, 2011
Mervyn's
Sep. 30, 2009
Mervyn's
Jul. 31, 2009
Mervyn's
store
Jun. 30, 2009
Mervyn's
Dec. 31, 2009
Non-core community centers
communitycenter
Jun. 30, 2011
GGP Exchange
store
Dec. 31, 2011
Shoppingtown Mall
Jun. 30, 2011
Shoppingtown Mall
Discontinued Operations:                              
Impairment charge         $ 1,037           $ 25,958       $ 35,729
Number of locations sold                   5   5      
Proceeds from sale of a former Mervyn's store       11,912   2,300 8,061 3,732 4,510 52,689   71,275      
Gain (loss) from sale of a former Mervyn's store (37,988) (23) (40,171) 144   (200) 3,783 (1,913) 4,087 (456)   16,933      
Impairment charge 45,458                            
Long-lived assets written off to fair value                             38,968
Loss on disposal (10,588) 3,661 29,161                     3,929  
Number of anchor locations exchanged                         6    
Number of Mervyn's stores exchanged                         5    
Revenues from discontinued operations 12,052 15,166 25,686                        
Loss from discontinued operations, including the net loss from disposition of assets $ 40,156 $ 3,126 $ 41,984