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Mortgage Notes Payable: (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Chandler Fashion Center
Dec. 31, 2011
Chandler Fashion Center
Mar. 31, 2012
Danbury Fair Mall
Dec. 31, 2011
Danbury Fair Mall
Mar. 31, 2012
Deptford Mall One
Dec. 31, 2011
Deptford Mall One
Mar. 31, 2012
Deptford Mall Two
Dec. 31, 2011
Deptford Mall Two
Mar. 31, 2012
Eastland Mall
Dec. 31, 2011
Eastland Mall
Mar. 31, 2012
Fashion Outlets at Niagara
Dec. 31, 2011
Fashion Outlets at Niagara
Mar. 31, 2012
Fiesta Mall
Dec. 31, 2011
Fiesta Mall
Mar. 31, 2012
Flagstaff Mall
Dec. 31, 2011
Flagstaff Mall
Mar. 31, 2012
Freehold Raceway Mall
Dec. 31, 2011
Freehold Raceway Mall
Sep. 30, 2009
Fresno Fashion Fair
Mar. 31, 2012
Fresno Fashion Fair
Dec. 31, 2011
Fresno Fashion Fair
Mar. 31, 2012
Great Northern Mall
Dec. 31, 2011
Great Northern Mall
Mar. 31, 2012
The Mall at Northgate
extension
Y
Mar. 23, 2012
The Mall at Northgate
Dec. 31, 2011
The Mall at Northgate
Mar. 31, 2012
The Oaks One
Y
Dec. 31, 2011
The Oaks One
Mar. 31, 2012
Pacific View
Mar. 30, 2012
Pacific View
Dec. 31, 2011
Pacific View
Mar. 31, 2012
Paradise Valley Mall
extension
Y
Dec. 31, 2011
Paradise Valley Mall
Mar. 31, 2012
Prescott Gateway
Dec. 31, 2011
Prescott Gateway
Mar. 31, 2012
Promenade at Casa Grande
Dec. 31, 2011
Promenade at Casa Grande
Mar. 31, 2012
Salisbury Center
Dec. 31, 2011
Salisbury Center
Mar. 31, 2012
SanTan Village Regional Center.
M
Dec. 31, 2011
SanTan Village Regional Center.
Mar. 31, 2012
South Plains Mall
Dec. 31, 2011
South Plains Mall
Mar. 31, 2012
South Towne center
Dec. 31, 2011
South Towne center
Mar. 31, 2012
Towne Mall
Dec. 31, 2011
Towne Mall
Mar. 31, 2012
Tucson La Encantada
Dec. 31, 2011
Tucson La Encantada
Mar. 31, 2012
Twenty Ninth Street
Dec. 31, 2011
Twenty Ninth Street
Mar. 31, 2012
Valley River Center
Dec. 31, 2011
Valley River Center
Mar. 31, 2012
Valley Mall
Y
Dec. 31, 2011
Valley Mall
Dec. 31, 2011
Valley View Center
Mar. 31, 2012
Mall of Victor Valley
extension
Y
Dec. 31, 2011
Mall of Victor Valley
Mar. 31, 2012
Vintage Faire Mall
Dec. 31, 2011
Vintage Faire Mall
Mar. 31, 2012
Westside Pavilion
Dec. 31, 2011
Westside Pavilion
Mar. 31, 2012
Wilton Mall
Dec. 31, 2011
Wilton Mall
Mortgage loans payable on real estate                                                                                                                                      
Carrying Amount of Mortgage Notes, Related Party $ 278,347,000   $ 279,430,000     $ 121,755,000 $ 122,382,000                               $ 81,457,000 $ 81,733,000                                                     $ 75,135,000 $ 75,315,000                              
Carrying Amount of Mortgage Notes, Other 3,084,392,000   3,049,008,000 154,487,000 155,489,000 121,755,000 122,381,000 172,500,000 172,500,000 14,973,000 15,030,000 168,000,000 168,000,000 128,413,000 129,025,000 84,000,000 84,000,000 37,000,000 37,000,000 232,900,000 232,900,000   81,458,000 81,734,000 37,015,000 37,256,000 64,000,000   38,115,000 256,565,000 257,264,000 140,000,000 140,000   83,250,000 84,000,000 60,000,000 60,000,000 76,309,000 76,598,000 115,000,000 115,000,000 138,087,000 138,087,000 102,403,000 102,760,000 86,213,000 86,525,000 12,660,000 12,801,000     107,000,000 107,000,000 43,404,000 43,543,000 120,000,000 120,000,000 125,000,000 97,000,000 97,000,000 135,000,000 135,000,000 175,000,000 175,000,000 40,000,000 40,000,000
Interest rate (as a percent)       5.50%   5.53%   5.41%   6.46%   5.79%   4.89%   4.98%   5.03%   4.20%     6.76%   5.19%   3.12% 3.12% 7.00% 2.24% 2.26% 4.08% 4.08% 5.21% 6.30%   5.78%   5.21%   5.83%   2.66%   6.55%   6.39%   4.99%   4.22%   3.08% 3.12% 5.85%   5.59%     2.10% 6.94% 3.53% 3.56% 2.51% 2.53% 1.25% 1.28%
Monthly Payment Term       1,043,000   1,538,000   778,000   101,000   811,000   727,000   341,000   151,000   805,000     1,104,000   234,000   133,000     426,000   668,000     402,000   289,000   286,000   555,000   270,000   648,000   554,000   100,000   368,000   256,000   280,000   559,000     149,000   365,000   327,000   31,000  
Debt discounts               (23,000) (25,000)                               (49,000) (55,000)                                                             (372,000) (365,000)                  
Debt premiums                           7,966,000 8,198,000                                                                   65,000 88,000                                  
Debt premiums (discounts), net (7,587,000)   (7,841,000)                                                                                                                                
Interest in the loan assumed by a third party (as a percent)                                           49.90%                                                                                          
Gain (loss) on early extinguishment of debt   (9,101,000)                                                                                                                                  
Interest rate basis                                                     LIBOR     LIBOR   LIBOR     LIBOR   LIBOR                               LIBOR             LIBOR   LIBOR   LIBOR   LIBOR  
Interest rate spread over basis (as a percent)                                                       2.25%   1.75%   4.00%     4.00%   2.10%                               2.63%             1.60%   3.00%   2.00%   0.675%  
Interest rate cap, effective limit on LIBOR (as a percent)                                                                                                                               5.00%      
Debt interest rate floor (as a percent)                                                               0.50%     5.50%                                                                
Deposit maintained with the lender                                                                                                                                   40,000,000  
Interest expense capitalized 2,353,000 3,335,000                                                                                                                                  
Fair value of mortgage notes payable 3,505,144,000 3,477,483,000                                                                                                                                  
Number of one year extension options                                                     2               2                                                 2              
Period of extension options (in years)                                                     1     1         1                                           1     1              
Period within which disposition of the property is anticipated (in months)                                                                                     12                                                
Amount of additonal borrowing                                                     $ 25,885,000