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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Land, building and improvements $ 7,543,376 $ 3,109,122
Furniture, equipment and other 7,612 6,979
Construction in progress 41,360 27,860
Investment properties, at cost $ 7,592,348 $ 3,143,961