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FAIR VALUE MEASUREMENTS (Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments | $ 1,009,587 | $ 1,009,373
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Derivatives - Other underwriting-related derivatives |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Net derivative assets (liabilities) | $ (10,942) |
Discount rate | 2.70% |
Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments | $ 27,118 |
Default rates | 3.00% |
Loss severity rate | 35.00% |
Collateral spreads | 3.00% |
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 | $ 48,787 |
Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Other investments | $ 1,438 |
Fair value of collateral | 100.00% |
Minimum | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 3.00% |
Minimum | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount margin | 0.10% |
Maximum | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 8.50% |
Maximum | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount margin | 12.00% |
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Derivatives - Other underwriting-related derivatives |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 2.70% |
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Default rates | 3.00% |
Loss severity rate | 35.00% |
Collateral spreads | 3.00% |
Estimated maturity dates | 7 years |
Weighted Average | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 7.20% |
Weighted Average | Liquidation value | Significant Unobservable Inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value of collateral | 100.00% |
Discount margin | 2.10% |

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