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FAIR VALUE MEASUREMENTS - Summary of Level 3 Fair Value Measurement Inputs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset fair value	$ 949,413	$ 996,751
Fixed maturities, available for sale	12,234,742	11,326,894
Significant unobservable inputs (Level 3)
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset fair value	92,589	141,174
Fixed maturities, available for sale	135,753	$ 119,104
Significant unobservable inputs (Level 3) | Discounted cash flow | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset fair value	$ 5,300
Estimated maturity date (years)	4 years
Significant unobservable inputs (Level 3) | Discounted cash flow | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset fair value	$ 18,940
Significant unobservable inputs (Level 3) | Discounted cash flow | Minimum | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Estimated maturity date (years)	0 years
Significant unobservable inputs (Level 3) | Discounted cash flow | Maximum | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Estimated maturity date (years)	2 years
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted average | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Estimated maturity date (years)	4 years
Significant unobservable inputs (Level 3) | Discounted cash flow | Weighted average | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Estimated maturity date (years)	1 year
Significant unobservable inputs (Level 3) | Discounted cash flow | Discount rate | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.060
Significant unobservable inputs (Level 3) | Discounted cash flow | Discount rate | Weighted average | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.060
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.045
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.005
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Weighted average | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.045
Significant unobservable inputs (Level 3) | Discounted cash flow | Default rate | Weighted average | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.005
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss severity rate | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.500
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss severity rate | Weighted average | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.500
Significant unobservable inputs (Level 3) | Discounted cash flow | Collateral spread | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.030
Significant unobservable inputs (Level 3) | Discounted cash flow | Collateral spread | Weighted average | CLO-Equities
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.030
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss absorption yield | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.010
Significant unobservable inputs (Level 3) | Discounted cash flow | Loss absorption yield | Weighted average | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Discounted cash flow	0.010
Significant unobservable inputs (Level 3) | Valuation, Market Approach | Other privately held investments
Fair Value Inputs Assets Quantitative Information [Line Items]
Asset fair value	$ 68,000

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 54B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482134/820-10-35-54B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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