Investments - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Investment Income [Line Items]
Total investment income	$ 5,664	$ 17,618
Investment expenses	(1,018)	(2,469)
Net investment income	4,646	15,149
Fixed maturity securities, available-for sale
Net Investment Income [Line Items]
Total investment income	6,676	3,224
Fixed maturity securities, held-to-maturity
Net Investment Income [Line Items]
Total investment income	1,003	1,937
Equity securities
Net Investment Income [Line Items]
Total investment income	726	738
Equity method investments
Net Investment Income [Line Items]
Total investment income	(4,664)	9,210
Mortgage loans
Net Investment Income [Line Items]
Total investment income	1,473	818
Indirect loans
Net Investment Income [Line Items]
Total investment income	(1,319)	1,657
Short-term investments and cash
Net Investment Income [Line Items]
Total investment income	1,789	27
Other
Net Investment Income [Line Items]
Total investment income	$ (20)	$ 7