INCOME TAXES - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Discounting of net reserves for losses and loss expenses	$ 66,338	$ 62,316
Unearned premiums	62,656	54,104
Net unrealized investments losses	36,536	54,395
Operating and capital loss carryforwards	75,864	100,907
Accruals not currently deductible	36,253	36,407
Tax credits	2,414	11,602
Bermuda economic transition adjustment	176,923	0
Other deferred tax assets	3,681	4,149
Deferred tax assets before valuation allowance	460,665	323,880
Valuation allowance	(19,829)	(38,711)
Deferred tax assets net of valuation allowance	440,836	285,169
Deferred tax liabilities:
Deferred acquisition costs	(35,401)	(27,109)
Other investment adjustments and impairments	(7,933)	(7,173)
Intangible assets	(47,355)	(49,486)
Depreciation and amortization	(7,586)	(1,140)
Equalization reserves	(2,347)	(2,726)
Acquisition adjustments (1)	0	(79,466)
Lloyd’s deferred year of account results	(51,770)	(38,194)
Other deferred tax liabilities	(9,970)	(7,025)
Deferred tax liabilities	(162,362)	(212,319)
Net deferred tax assets (liabilities)	$ 278,474	$ 72,850	$ 108,220