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FAIR VALUE MEASUREMENTS - Level 3 fair value inputs (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 770,923 | $ 787,787
Net derivative liability | (13,637) | (14,522)
Fixed maturities | 12,468,205 | 11,435,347
Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | 51,262 | 65,789
Net derivative liability | (9,672) | (10,299)
Fixed maturities | 8,021 | 86,679
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 14,328 |
Estimated maturity dates (years) | 7 years |
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity dates (years) | 7 years |
Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 36,934 | 44,518
Other privately held investments | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 36,934 | $ 44,518
Default rates | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.035 |
Default rates | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.035 |
Loss severity rate | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.350 |
Loss severity rate | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.350 |
Collateral spreads | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Collateral spreads | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Discount rate | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivative liability, measurement input | 0.018 |
Discount rate | Significant unobservable inputs (Level 3) | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivative liability, measurement input | 0.018 |

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