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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 |

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