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Investments - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment income (loss) from portfolios
Total investment income		$ 29,881	$ 63,426	$ 31,214
Less: investment expenses		1,296	1,249	1,461
Net investment income		28,585	62,177	29,753
Available-for-sale securities
Investment income (loss) from portfolios
Available-for-sale, equity securities, cash equivalents, and other		31,913	23,795	22,631
Equity securities
Investment income (loss) from portfolios
Available-for-sale, equity securities, cash equivalents, and other		3,904	4,321	4,147
Limited partnerships
Investment income (loss) from portfolios
Limited partnerships		(10,446)	31,701	(602)
Limited partnerships \| Forecast \| Private equity
Investment income (loss) from portfolios
Unrealized loss on limited partnership	$ 11,000
Cash equivalents and other
Investment income (loss) from portfolios
Available-for-sale, equity securities, cash equivalents, and other		$ 4,510	$ 3,609	$ 5,038