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Beneficial Interest in Debt and Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Interest 30.00%    
At 100% [Abstract]      
Notes Payable $ 4,003,126   $ 3,710,327
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities 3,060,022   3,049,737
Capitalized interest, consolidated subsidiaries at 100% 1,707 $ 2,057  
Capitalized interest, unconsolidated joint ventures @100% 276 33  
Interest expense, consolidated subsidiaries at 100% 34,849 36,885  
Interest Expense, Unconsolidated Joint Ventures, at 100% 34,657 32,498  
At beneficial interest [Abstract]      
Debt Consolidated Subsidiaries At Beneficial Interest 3,712,400   3,419,625
Debt, unconsolidated joint ventures at beneficial interest 1,481,496   $ 1,508,506
Capitalized interest, consolidated subsidiaries at beneficial interest 1,676 2,053  
Capitalized Interest, Unconsolidated Joint Ventures at Beneficial Interest 177 18  
Interest expense, consolidated subsidiaries at beneficial interest 32,053 33,860  
Interest expense, unconsolidated joint ventures at beneficial interest $ 16,415 $ 16,776  
Cherry Creek Shopping Center [Member]      
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Interest 50.00%    
International Market Place [Member]      
Debt Instrument [Line Items]      
Noncontrolling Interest, Ownership Percentage by Noncontrolling Interest 6.50%    
At 100% [Abstract]      
Notes Payable $ 250,000    
Line of Credit [Member]      
At beneficial interest [Abstract]      
Proceeds from Lines of Credit 350,000    
Line of Credit Facility, Maximum Borrowing Capacity 1,100,000    
Line of Credit Facility, Remaining Borrowing Capacity 97,500    
Secondary Line of Credit [Member]      
At beneficial interest [Abstract]      
Line of Credit Facility, Maximum Borrowing Capacity $ 65,000