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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Total investment income									$ 50,783	$ 28,424	$ 15,556
Less: Investment expenses									(2,334)	(2,639)	(3,021)
Net investment income	$ 13,714	$ 12,755	$ 11,282	$ 10,698	$ 10,448	$ 6,074	$ 5,221	$ 4,042	48,449	25,785	12,535
Available-for-sale debt securities
Net Investment Income [Line Items]
Investment income									24,793	18,699	11,926
Equity securities
Net Investment Income [Line Items]
Investment income									4,019	3,288	2,651
Cash and Cash Equivalents
Net Investment Income [Line Items]
Investment income									21,448	5,945	51
Other
Net Investment Income [Line Items]
Investment income									$ 523	$ 492	$ 928