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FAIR VALUE MEASUREMENTS (Significant Unobservable Inputs) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 779,200 | $ 787,787
Derivatives - Other underwriting-related derivatives | (17,601) | (14,522)
Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | 46,173 | 65,789
Derivatives - Other underwriting-related derivatives | (10,136) | $ (10,299)
Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivatives - Other underwriting-related derivatives | $ (10,136) |
Discounted cash flow | Significant unobservable inputs (Level 3) | Discount rate |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.016 |
Discounted cash flow | Significant unobservable inputs (Level 3) | Discount rate | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.016 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 15,454 |
Estimated maturity dates | 7 years |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity dates | 7 years |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Default rates |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.035 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Default rates | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.035 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Loss severity rate |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.350 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Loss severity rate | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.350 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Collateral spreads |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Other investments - CLO-Equities | Discounted cash flow | Significant unobservable inputs (Level 3) | Collateral spreads | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Other investments - Other privately held investments | Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 30,719 |
Other investments - Other privately held investments | Discounted cash flow | Significant unobservable inputs (Level 3) | Discount rate |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Other investments - Other privately held investments | Discounted cash flow | Significant unobservable inputs (Level 3) | Discount rate | Weighted average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |

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