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FAIR VALUE MEASUREMENTS - Summary of Level 3 Fair Value Measurement Inputs (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Asset fair value | $ 996,751 | $ 947,982
Fixed maturities, available for sale | 11,326,894 | 12,313,200
Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Asset fair value | 141,174 | 110,431
Fixed maturities, available for sale | 119,104 | $ 42,894
Significant unobservable inputs (Level 3) | Discounted cash flow | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Asset fair value | $ 5,016 |
Estimated maturity date (years) | 5 years |
Significant unobservable inputs (Level 3) | Discounted cash flow | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Asset fair value | $ 17,169 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Minimum | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity date (years) | 1 year |
Significant unobservable inputs (Level 3) | Discounted cash flow | Maximum | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity date (years) | 3 years |
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted average | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity date (years) | 5 years |
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted average | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity date (years) | 2 years |
Significant unobservable inputs (Level 3) | Discounted cash flow | Discount rate | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.066 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Discount rate | Weighted average | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.066 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.045 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.005 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Weighted average | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.045 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Weighted average | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.005 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss severity rate | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.500 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss severity rate | Weighted average | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.500 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Collateral spread | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.030 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Collateral spread | Weighted average | CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.030 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss absorption yield | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.010 |
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss absorption yield | Weighted average | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discounted cash flow | 0.010 |
Significant unobservable inputs (Level 3) | Valuation, Market Approach | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Asset fair value | $ 119,000 |

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