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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Land, buildings and improvements $ 7,696,890 $ 7,684,066
Construction in progress 61,482 55,995
Investment properties, at cost $ 7,758,372 $ 7,740,061