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Mortgage Notes Payable - Footnotes (Details) - USD ($)
12 Months Ended
Jul. 15, 2016
Jan. 14, 2016
Jan. 06, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 06, 2016
Mortgage loans payable on real estate              
Unamortized deferred finance costs       $ 12,716,000 $ 16,025,000    
Gain (loss) on extinguishment of debt       $ 13,737,000 $ 16,066,000 $ (526,000)  
Northgate Mall              
Mortgage loans payable on real estate              
Effective interest rate (as a percent)       3.50%      
Arrowhead Towne Center              
Mortgage loans payable on real estate              
Interest in the loan assumed by a third party (as a percent)     40.00%        
Percentage of ownership interest sold     40.00%        
MAC Heitman Portfolio              
Mortgage loans payable on real estate              
Percentage of ownership interest sold   49.00%   49.00%      
MAC Heitman Portfolio | Joint venture              
Mortgage loans payable on real estate              
Percentage of ownership interest sold   49.00%          
Arrowhead Towne Center              
Mortgage loans payable on real estate              
Face amount of debt     $ 400,000,000        
Effective interest rate (as a percent)     4.05%        
Gain (loss) on extinguishment of debt     $ (3,575,000)        
Interest in the loan assumed by a third party (as a percent)     40.00%        
Chandler Fashion Center              
Mortgage loans payable on real estate              
Interest in the loan assumed by a third party (as a percent)       49.90%      
Fashion Outlets of Chicago              
Mortgage loans payable on real estate              
Effective interest rate (as a percent)       2.43% 1.84%    
Variable interest rate spread (as a percent)       1.50%      
Flagstaff Mall              
Mortgage loans payable on real estate              
Gain (loss) on extinguishment of debt $ 5,284,000            
Fresno Fashion Fair              
Mortgage loans payable on real estate              
Face amount of debt             $ 325,000,000
Effective interest rate (as a percent)       3.67%      
Northgate Mall              
Mortgage loans payable on real estate              
Effective interest rate (as a percent)         3.30%    
Variable interest rate spread (as a percent)       2.25%