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Significant Accounting Policies - Noncontrolling Interests, Simon Property Group, Inc. (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Significant Accounting Policies    
Limited partners' interests in the Operating Partnership $ 259,797 $ 378,339
Nonredeemable noncontrolling interests in properties, net 3,568 6,513
Total noncontrolling interests reflected in equity $ 263,365 $ 384,852