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FAIR VALUE MEASUREMENTS - Significant Unobservable Inputs (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other investments, at fair value $ 936,680 $ 949,413
Fixed maturities, available for sale 12,585,137 12,234,742
Significant unobservable inputs (Level 3)    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other investments, at fair value 89,786 92,589
Fixed maturities, available for sale 125,009 $ 135,753
Significant unobservable inputs (Level 3) | Valuation, Market Approach    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Fixed maturities, available for sale 125,000  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other investments, at fair value $ 4,498  
Estimated maturity date 4 years  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Estimated maturity date 4 years  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Default rate    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.045  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Default rate | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.045  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Loss severity rate    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.500  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Loss severity rate | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.500  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Collateral spread    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.030  
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Discounted cash flow | Collateral spread | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.030  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other investments, at fair value $ 14,593  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Estimated maturity date 1 year  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Minimum    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Estimated maturity date 0 years  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Maximum    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Estimated maturity date 1 year  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Default rate    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.005  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Default rate | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.005  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Discount rate    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.063  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Discount rate | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.063  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Loss absorption yield    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.010  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Discounted cash flow | Loss absorption yield | Weighted average    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Unobservable input (as a percent) 0.010  
Significant unobservable inputs (Level 3) | Other investments - Other privately held investments | Valuation, Market Approach    
Fair Value Inputs Assets Quantitative Information [Line Items]    
Other investments, at fair value $ 71,000