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Beneficial Interest in Debt and Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
At 100% [Abstract]      
Notes Payable $ 3,287,968   $ 3,255,512
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities 2,843,331   2,777,162
Capitalized interest, consolidated subsidiaries at 100% 4,081 $ 6,502  
Capitalized interest, unconsolidated joint ventures @100% 551 655  
Interest expense, consolidated subsidiaries at 100% 25,546 19,128  
Interest Expense, Unconsolidated Joint Ventures, at 100% 30,369 21,596  
At beneficial interest [Abstract]      
Debt Consolidated Subsidiaries At Beneficial Interest 2,996,892   2,949,440
Debt, unconsolidated joint ventures at beneficial interest 1,454,852   $ 1,425,511
Capitalized interest, consolidated subsidiaries at beneficial interest 4,039 6,486  
Capitalized Interest, Unconsolidated Joint Ventures at Beneficial Interest 551 655  
Interest expense, consolidated subsidiaries at beneficial interest 22,571 17,176  
Interest expense, unconsolidated joint ventures at beneficial interest $ 15,781 $ 11,528  
Cherry Creek Shopping Center [Member]      
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 50.00%    
International Market Place [Member]      
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 6.50%    
At 100% [Abstract]      
Notes Payable $ 258,600    
The Mall of San Juan [Member]      
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 5.00%    
Line of Credit [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000