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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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