Investments - Schedule of Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Sales and other	$ (11,563)	$ (77,301)	$ (32,552)
Provision for credit losses	(3,280)	(7,115)	387
Fair value option—change in fair value	(16,717)	15,102	(29,353)
Mortgage loans	(3,972)	(5,603)	(963)
Other investments	2,936	1,792	4,681
Realized gains (losses) from investments	(32,596)	(73,125)	(57,800)
Other gains (losses)	8,408	7,449	(18,748)
Total realized gains (losses)	(24,188)	(65,676)	(76,548)
Applicable tax	5,080	13,792	16,075
Realized gains (losses), net of tax	(19,108)	(51,884)	(60,473)
Exchanges of fixed maturities	105,600	50,900	147,600
Exchanges of fixed maturities, net realized gains	$ 0	(1,900)	$ 1,900
Securities sold with a provision for credit losses		$ 66,000