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Organization and Significant Accounting Policies - Schedule of Variable Interest Entities (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
RetailShoppingCenter
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 10,853,903 $ 10,936,904
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 4,710,439 4,878,757
Noncontrolling Interest in Variable Interest Entity 28,057 28,685
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 64,434 6,340
Real Estate [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 237,232 127,240
Cash and Cash Equivalents [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 23,587 $ 4,496
Partially Owned Properties [Member]    
Variable Interest Entity [Line Items]    
Number of real estate properties | RetailShoppingCenter 114  
Consolidated Properties [Member]    
Variable Interest Entity [Line Items]    
Number of real estate properties | RetailShoppingCenter 10