Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Net realized gains (losses) on sales of equity securities	$ 1,396	$ (112)	$ 3,115
Change in net unrealized gains (losses) of equity securities still held as of as of December 31, 2022, 2021 and 2020	(4,797)	0	0
Net realized and unrealized gains (losses) on equity securities	$ (3,401)	$ (112)	$ 3,115