Summary of Investments - Net Investment Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net investment gains (losses):
Available-for-sale	$ (1,731)	$ (19)	$ (5,776)	$ (445)
Allowance for credit losses	0	(125)	1	(123)
Net gains (losses) recognized on equity securities sold during the period	0	(2,085)	1,362	150
Unrealized gains (losses) recognized during the period on equity securities held at reporting date	0	204	0	(1,960)
Net gains (losses) recognized during the reporting period on equity securities	0	(1,881)	1,362	(1,810)
Mortgage loans allowance for credit losses	0	1	10	(5)
Other long-term investments	51	64	292	(245)
Real estate	0	0	0	47
Total net investment gains (losses)	$ (1,680)	$ (1,960)	$ (4,111)	$ (2,581)