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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Investment Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Land, buildings and improvements $ 3,103,198 $ 3,109,122
Furniture, equipment and other 6,964 6,979
Construction in progress 27,368 27,860
Investment properties, at cost $ 3,137,530 $ 3,143,961