Insurance Contracts - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Insurance [Line Items]
Reinsurance Recoverable Credit Exposure	$ 242,613		$ 232,310
Reinsurance Payable	81,358		53,002
Uncollectable premium receivables	142		142
Reinsurance recoveries of losses included in losses and loss expenses	45,778	$ 34,411
Amortization of Intangible Assets	8,763	1,139
Intangible Assets, Gross (Excluding Goodwill)	381,328		371,680
Finite-Lived Intangible Assets, Accumulated Amortization	36,267		26,905
Intangible assets, less accumulated amortization	345,061		344,775
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,026,048	$ 1,418,165	$ 1,054,661	$ 1,414,615