Investments - Gains (Losses) Related to Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized during the period	$ 2,983	$ (17,328)	$ 8,447	$ (33,878)
Less: net gains recognized during the period on equity securities sold during the period	5,259	5,217	5,849	9,756
Unrealized (losses) gains recognized during the period on equity securities held	$ (2,276)	$ (22,545)	$ 2,598	$ (43,634)