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Basis of Presentation, Consolidation, Investments in Joint Ventures, and Noncontrolling Interests - Investment Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Land, buildings and improvements $ 3,111,386 $ 3,600,743
Furniture, equipment and other 7,667 7,741
Construction in progress 34,383 32,636
Investment properties, at cost $ 3,153,436 $ 3,641,120