Significant Accounting Policies - Noncontrolling Interests, Simon Property Group, Inc. (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Significant Accounting Policies
Limited partners' interests in the Operating Partnership	$ 436,693	$ 448,076
Nonredeemable noncontrolling interests in properties, net	20,981	25,052
Total noncontrolling interests reflected in equity	$ 457,674	$ 473,128