Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Fixed maturities, available for sale, amortized cost	$ 19,229,273	$ 18,924,914
Fixed maturities, available for sale, allowance for credit losses	7,132	7,115
Other long-term investments under fair value option	974,515	835,878
Liabilities:
Future policy benefits at original rates	17,269,793	16,984,615
Total long-term debt, fair value	$ 1,376,196	$ 1,491,229
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)	102,218,183	102,218,183
Common stock, shares outstanding (in shares)	102,218,183	102,218,183
Common stock, shares held in treasury (in shares)	12,176,343	8,426,854
Investment funds
Assets:
Other long-term investments under fair value option	$ 915,665	$ 795,583