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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Investment Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Land, buildings and improvements $ 3,048,503 $ 3,038,412
Furniture, equipment and other 7,026 7,775
Construction in progress 27,624 41,204
Investment properties, at cost $ 3,083,153 $ 3,087,391