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Notes Payable, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Item]      
Notes Payable $ 3,710,327 $ 3,830,195  
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities 3,049,737 2,815,617  
Debt Issuance Costs, Net (12,857) (13,988)  
Debt Instrument, Collateral Amount 1,700,000    
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 161,747    
Long-term Debt, Maturities, Repayments of Principal in Year Two 262,329    
Long-term Debt, Maturities, Repayments of Principal in Year Three 12,867    
Long-term Debt, Maturities, Repayments of Principal in Year Four 502,278    
Long-term Debt, Maturities, Repayments of Principal in Year Five 692,715    
Thereafter 2,091,249    
Total principal maturities $ 3,723,185    
Debt covenants and guarantees [Abstract]      
Restrictions on Payment of Dividends 95.00%    
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 30.00%    
At 100% [Abstract]      
Capitalized interest, consolidated subsidiaries at 100% $ 7,807 15,221 $ 12,400
Capitalized interest, unconsolidated joint ventures at 100% (Asia Unconsolidated Joint Venture Construction Loans at Beneficial Interest) 330 30  
Interest expense, consolidated subsidiaries at 100% 148,407 133,197 108,572
Interest Expense, unconsolidated joint ventures, at 100% 139,756 132,669  
At beneficial interest [Abstract]      
Debt, consoldiated subsidiaries at beneficial interest 3,419,625 3,539,588  
Debt, unconsolidated joint ventures at beneficial interest 1,508,506 1,437,445  
Capitalized interest, consolidated subsidiaries at beneficial interest 7,767 15,133  
Capitalized interest, unconsolidated joint ventures at beneficial interest 196 18  
Interest expense, consolidated subsidiaries at beneficial interest 136,694 121,166  
Interest expense, unconsolidated joint ventures at beneficial interest $ 69,749 68,225 $ 67,283
Secondary Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Interest Rate Terms LIBOR + 1.40%    
Debt Instrument, Maturity Date Apr. 25, 2020    
Line of Credit Facility, Maximum Borrowing Capacity $ 65,000    
Long-term Line of Credit 34,675  
Line of Credit Facility, Remaining Borrowing Capacity 55,300    
Letters of Credit Outstanding, Amount $ 9,700    
Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Interest Rate Terms LIBOR + 1.38%    
Debt Instrument, Maturity Date Feb. 01, 2024    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000    
Length Of Extension Option six-month    
Number of Extension Options two    
Long-term Line of Credit $ 675,000 725,000  
Line of Credit Facility, Remaining Borrowing Capacity 367,500    
Line of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature $ 2,000,000    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Derivative, Fixed Interest Rate 2.14%    
Primary Line of Credit Swapped Portion $ 25,000    
Unsecured Debt 300M Term Loan [Member]      
Debt Instrument [Line Item]      
Unsecured Debt 300,000  
Debt Instrument, Interest Rate Terms    
Debt Instrument, Maturity Date    
Unsecured Debt 275M Term Loan [Member]      
Debt Instrument [Line Item]      
Unsecured Debt $ 275,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.55%    
Debt Instrument, Maturity Date Feb. 01, 2025    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Derivative, Fixed Interest Rate 2.14%    
Unsecured Debt 250M Term Loan [Member]      
Debt Instrument [Line Item]      
Unsecured Debt $ 250,000 250,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.60%    
Debt Instrument, Maturity Date Mar. 31, 2023    
Line of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature $ 400,000    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Derivative, Fixed Interest Rate 3.02%    
Cherry Creek Shopping Center [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 550,000 550,000  
Debt Instrument, Interest Rate, Stated Percentage 3.85%    
Debt Instrument, Maturity Date Jun. 01, 2028    
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 50.00%    
City Creek Center [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 75,359 77,068  
Debt Instrument, Interest Rate, Stated Percentage 4.37%    
Debt Instrument, Maturity Date Aug. 01, 2023    
Great Lakes Crossing Outlets [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 193,515 198,625  
Debt Instrument, Interest Rate, Stated Percentage 3.60%    
Debt Instrument, Maturity Date Jan. 06, 2023    
The Mall at Green Hills [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 150,000 150,000  
Debt Instrument, Interest Rate Terms LIBOR+1.45% LIBOR capped at 3.00%    
Debt Instrument, Maturity Date Dec. 01, 2020    
Length Of Extension Option one-year    
Number of Extension Options one    
International Market Place [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 250,000 250,000  
Debt Instrument, Interest Rate Terms LIBOR + 2.15%    
Debt Instrument, Maturity Date Aug. 09, 2021    
Length Of Extension Option one-year    
Number of Extension Options two    
Debt covenants and guarantees [Abstract]      
Unconditional Guaranty Liability, Principal Balance, Percent 100.00%    
Unconditional Guaranty Liability, Interest, Percent 100.00%    
Interest Payable $ 800    
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 6.50%    
International Market Place and The Mall at Green Hills [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 250,000    
Length Of Extension Option one-year    
The Mall at Short Hills [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 1,000,000 1,000,000  
Debt Instrument, Interest Rate, Stated Percentage 3.48%    
Debt Instrument, Maturity Date Oct. 01, 2027    
Twelve Oaks Mall [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 292,311 296,815  
Debt Instrument, Interest Rate, Stated Percentage 4.85%    
Debt Instrument, Maturity Date Mar. 06, 2028    
International Plaza [Member]      
Debt Instrument [Line Item]      
Interest Rate Derivative Liabilities, at Fair Value $ 800    
Debt Instrument, Face Amount $ 175,000    
Debt covenants and guarantees [Abstract]      
Company's Percentage Share of Derivative Guarantee 50.10%    
Interest Payable $ 100    
Minimum [Member] | Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.05%    
Line of Credit Facility, Commitment Fee Percentage 0.20%    
Total Swapped Rate On Loan 3.19%    
Minimum [Member] | Unsecured Debt 300M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
Total Swapped Rate On Loan 3.39%    
Minimum [Member] | Unsecured Debt 275M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.15%    
Total Swapped Rate On Loan 3.29%    
Minimum [Member] | Unsecured Debt 250M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
Total Swapped Rate On Loan 4.27%    
Maximum [Member] | Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.60%    
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Total Swapped Rate On Loan 3.74%    
Maximum [Member] | Unsecured Debt 300M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Total Swapped Rate On Loan 4.04%    
Maximum [Member] | Unsecured Debt 275M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.80%    
Total Swapped Rate On Loan 3.94%    
Maximum [Member] | Unsecured Debt 250M Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Total Swapped Rate On Loan 4.92%    
Office Building [Member]      
Debt Instrument [Line Item]      
Notes Payable $ 12,000 $ 12,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.40% Swapped to 3.49%    
Debt Instrument, Maturity Date Mar. 01, 2024