REINSURANCE (Details) $ in Thousands		12 Months Ended
	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 13, 2024 USD ($)
Premiums written
Gross		$ 9,005,888	$ 8,356,525	$ 8,214,595
Ceded		(3,248,537)	(3,254,200)	(2,951,539)
NET AMOUNT		5,757,351	5,102,325	5,263,056
Premiums earned
Gross		8,529,567	7,973,577	7,936,382
Ceded		(3,223,332)	(2,889,796)	(2,776,056)
Net		5,306,235	5,083,781	5,160,326
Reinsurance receivables:
Ceded losses and loss expenses		2,039,000	1,754,000	1,754,000
Reinsurance recoverable on unpaid and paid losses and loss expenses		7,400,000	6,900,000
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses		$ 43,445	$ 36,611	$ 30,715
Cavello Bay Reinsurance Limited | Related Party
Reinsurance receivables:
Loss portfolio transfer reinsurance agreement, ground-up quota share, percentage					0.75
Loss portfolio transfer reinsurance agreement, loss expense	$ 3,100,000
Loss portfolio transfer reinsurance agreement, policy limit					$ 940,000