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FAIR VALUE MEASUREMENTS (Significant Unobservable Inputs) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 795,331 | $ 787,787
Derivatives - Other underwriting-related derivatives | (13,837) | (14,522)
Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | 65,707 | 65,789
Derivatives - Other underwriting-related derivatives | (10,233) | $ (10,299)
Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivatives - Other underwriting-related derivatives | (10,233) |
Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 18,022 |
Estimated maturity dates | 7 years |
Discounted cash flow | Significant unobservable inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 47,685 |
Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Estimated maturity dates | 7 years |
Default rates | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Default rates | Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Loss severity rate | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.350 |
Loss severity rate | Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.350 |
Collateral spreads | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Collateral spreads | Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Discount rate | Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.023 |
Discount rate | Minimum | Discounted cash flow | Significant unobservable inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.030 |
Discount rate | Maximum | Discounted cash flow | Significant unobservable inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.080 |
Discount rate | Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.023 |
Discount rate | Weighted average | Discounted cash flow | Significant unobservable inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable input | 0.065 |

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