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DEBT AND FINANCING ARRANGEMENTS - Loan Advances Made to a Third Party Reinsurer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Loan advance	$ 349,842	$ 105,822	$ 82,870
Loan advances made	305,222	87,160
Third Party Reinsurer | Related Party
Debt Instrument [Line Items]
Non-cash repayment of advance	110,000	90,000	$ 71,000
Interest received	4,000	1,000
Third Party Reinsurer | Loan Agreement With Monarch Point Re | Related Party
Debt Instrument [Line Items]
Loan advance	102,000	116,000
Non-cash repayment of advance	82,000	80,000
Loan advances made	80,000	87,000
Interest received	1,000	$ 1,000
Other Commitment	$ 26,000
Third Party Reinsurer | Loan Agreement With Monarch Point Re | Related Party | Minimum
Debt Instrument [Line Items]
Stated interest rate (in percent)	0.80%	0.80%
Third Party Reinsurer | Loan Agreement With Monarch Point Re | Related Party | Maximum
Debt Instrument [Line Items]
Stated interest rate (in percent)	4.00%	4.00%

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