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Basis of Presentation and Summary of Significant Accounting Policies - Investment Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investment properties, at cost:    
Land, buildings and improvements $ 3,038,412 $ 3,600,743
Furniture, equipment and other 7,775 7,741
Construction in progress 41,204 32,636
Investment properties, at cost $ 3,087,391 $ 3,641,120