Basis of Presentation and Summary of Significant Accounting Policies - Stock Split and Reinsurance (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Jan. 15, 2025 $ / shares	Sep. 30, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares
Reinsurance
Amount of allowance for uncollectible amounts on paid recoverables		$ 17,000	$ 17,000
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts		11,063	$ 9,580
Financing receivable, allowance for credit Loss, write-off		$ 0
Common stock
Common stock split ratio	2
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01
Maximum
Reinsurance
Financing receivable, allowance for credit loss, recovery		$ 1,000