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Mortgages and Other Indebtedness (Operating Properties) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Principal balance [Member]
loan
Sep. 30, 2014
Principal amortization [Member]
Sep. 30, 2014
Chapel Hill Mall [Member]
Sep. 30, 2014
Citadel Mall [Member]
Jan. 31, 2014
Citadel Mall [Member]
Sep. 30, 2014
Columbia Place [Member]
loan
Sep. 30, 2014
Columbia Place [Member]
Principal balance [Member]
Sep. 30, 2014
Operating property loan [Member]
loan
Jan. 31, 2014
St. Clair Square [Member]
Apr. 30, 2014
Outlet Shoppes at Oklahoma City, Phase II [Member]
extension_option
Apr. 30, 2014
Outlet Shoppes at Oklahoma City, Phase II [Member]
LIBOR [Member]
Apr. 30, 2014
Outlet Shoppes at Oklahoma City, Phase III [Member]
extension_option
Apr. 30, 2014
Outlet Shoppes at Oklahoma City, Phase III [Member]
LIBOR [Member]
Apr. 30, 2014
Outlet Shoppes at El Paso [Member]
Apr. 30, 2014
Outlet Shoppes at El Paso [Member]
LIBOR [Member]
Oct. 31, 2014
Subsequent Event [Member]
Operating property loan [Member]
Debt Instrument [Line Items]                                          
Loan agreement, basis spread on variable rate                               2.75%   2.75%   2.75%  
Amount Financed                             $ 6,000,000   $ 5,400,000   $ 7,000,000    
Number of extension options available                             2   2        
Debt instrument, option extension term                             1 year   1 year        
Debt instrument, percentage of debt guaranteed                                 100.00%   100.00%    
Mortgages on Operating Properties [Abstract]                                          
Interest Rate at Repayment Date                           3.25%              
Principal Balance Repaid                           122,375,000              
Gain (loss) on extinguishment of debt 18,282,000 0 60,942,000 (9,108,000)       18,259,000 43,932,000         (1,249,000)              
Mortgage loan, carrying amount               68,563,000   68,169,000 27,265,000                    
Debt instrument, maturity date                     Sep. 01, 2013                    
Number of debt instruments           2         1   1                
Weighted average maturity of mortgage and other indebtedness (in years)     4 years 3 months 0 days   4 years 8 months 1 day                                
Schedule of principal repayments [Abstract]                                          
2014 207,268,000   207,268,000     161,510,000 18,493,000         27,265,000                 113,400,000
2015 729,861,000   729,861,000                                    
2016 802,137,000   802,137,000                                    
2017 495,409,000   495,409,000                                    
2018 676,511,000   676,511,000                                    
Thereafter 1,796,419,000   1,796,419,000                                    
Total payments 4,707,605,000   4,707,605,000                   48,110,000                
Net unamortized premiums 3,816,000   3,816,000                                    
Mortgage and other indebtedness $ 4,711,421,000   $ 4,711,421,000