Investments - Schedule of Realized Gain (Loss) on Investments (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]
Sales and other	$ (10,606)	$ (22,421)	$ (10,963)	$ (17,872)
Provision for credit losses	(39,741)	0	(72,508)	387
Fair value option—change in fair value	5,228	947	7,086	(4,391)
Other investments	(724)	(8,972)	(385)	(15,814)
Realized gains (losses) from investments	(45,843)	(30,446)	(76,770)	(37,690)
Applicable tax	9,627	6,394	16,122	7,915
Realized gains (losses), net of tax	(36,216)	(24,052)	(60,648)	(29,775)
Exchanges of fixed maturities	$ 17,900	$ 1,900	$ 17,900	$ 1,900