Supplemental Balance Sheet and Cash Flow Information - Schedule of Restricted Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash and cash equivalents	$ 154,362	$ 138,823	$ 158,604
Fixed maturity securities	555,902	675,302
Equity securities	0	34,871
Total restricted assets	$ 710,264	$ 848,996

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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