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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]    
Land, buildings and improvements $ 7,684,066 $ 7,656,765
Construction in progress 55,995 75,808
Investment properties, at cost $ 7,740,061 $ 7,732,573