Investments - Portion of Net Unrealized Gains (Losses) Recognized During the Reporting Period (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Equity securities:
Net gains (losses) recognized during the period	$ 359	$ (7,902)	$ (3,304)	$ (13,103)
Less: net losses recognized on securities sold	(78)	(51)	(2,704)	(409)
Net unrealized gains (losses) recognized on securities held at reporting date	$ 437	$ (7,851)	$ (600)	$ (12,694)