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INVESTMENTS - Equity Method Investments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Payments to acquire equity method investments $ 14,407 $ 22,183 $ 0  
Monarch Point Re        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire equity method investments $ 14,000 $ 22,000    
Equity method investment, ownership percentage 18.00% 18.00%    
Harrington Reinsurance Holdings Limited        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire equity method investments       $ 108,000
Equity method investment, ownership percentage 22.00% 20.00%   19.00%
Equity method investment, difference between carrying amount and underlying equity       $ 5,000