Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets:
Fixed maturities, available for sale, amortized cost	$ 19,133,385	$ 18,820,464
Fixed maturities, available for sale, allowance for credit losses	3,297	3,297
Other long-term investments under fair value option	1,435,099	1,396,064
Liabilities:
Future policy benefits at original rates	18,304,438	18,129,506
Total long-term debt, fair value	$ 2,177,494	$ 2,225,320
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	320,000,000	320,000,000
Common stock, shares issued (in shares)	92,218,183	92,218,183
Common stock, shares outstanding (in shares)	92,218,183	92,218,183
Treasury stock, at cost (in shares)	14,331,326	13,125,082
Investment funds
Assets:
Other long-term investments under fair value option	$ 1,070,296	$ 1,109,719