Investments - Realized 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]
Sales and other	$ (32,552)	$ 34,916	$ (22,999)
Provision for credit losses	387	2,959	(3,346)
Investment funds—fair value option	(29,353)	22,918	1,045
Other investments	(15,030)	7,840	21,563
Realized gains (losses) from investments	(76,548)	68,633	(3,737)
Realized loss—redemption of debt	0	(9,314)	(634)
Total realized gains (losses)	(76,548)	59,319	(4,371)
Applicable tax	16,075	(12,457)	1,955
Realized gains (losses), net of tax	(60,473)	46,862	(2,416)
Exchanges of fixed maturities	147,600	109,200	219,800
Exchanges of fixed maturities, net realized gains	$ 1,900	$ 25,200	$ 7,900