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FAIR VALUE MEASUREMENTS - Level 3 fair value inputs (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 787,787 | $ 1,009,373
Net derivative liability | (14,522) | (14,386)
Significant unobservable inputs (Level 3) |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | 65,789 | 77,843
Net derivative liability | (10,299) | $ (11,510)
Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 21,271 |
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 |
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Fair value | $ 44,518 |
Default rates | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Default rates | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Loss severity rate | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.35 |
Loss severity rate | Significant unobservable inputs (Level 3) | Other investments - CLO-Equities | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.35 |
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 | 0.026 |
Discount rate | Significant unobservable inputs (Level 3) | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Derivative liability | 0.026 |
Discount rate | Significant unobservable inputs (Level 3) | Other privately held investments | Minimum |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.030 |
Discount rate | Significant unobservable inputs (Level 3) | Other privately held investments | Maximum |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.080 |
Discount rate | Significant unobservable inputs (Level 3) | Other privately held investments | Weighted Average |  |
Fair Value Inputs Assets Quantitative Information [Line Items] |  |
Discount rate | 0.071 |

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