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FAIR VALUE MEASUREMENTS (Significant Unobservable Inputs) (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | $ 833,563 | $ 1,009,373
Derivatives - Other underwriting-related derivatives | (15,120) | $ (14,386)
Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivatives - Other underwriting-related derivatives | (10,212) |
Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments, at fair value | 47,389 |
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 | $ 24,264 |
Estimated maturity dates | 7 years |
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 | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Discount rate | Minimum | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable Input | 0.030 |
Discount rate | Maximum | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable Input | 0.085 |
Discount rate | Weighted Average | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Discount rate | Weighted Average | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Unobservable Input | 0.072 |

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