Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Fixed maturities, available for sale, amortized cost	$ 18,924,914	$ 18,301,692
Fixed maturities, available for sale, allowance for credit losses	7,115	0
Other long-term investments under fair value option	835,878	794,711
Liabilities:
Net liabilities for future policy benefits	16,984,615	16,355,726
Total long-term debt, fair value	$ 1,491,229	$ 1,440,277
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	105,218,183
Common stock, shares outstanding (in shares)	102,218,183	105,218,183
Common stock, shares held in treasury (in shares)	8,426,854	8,478,288
Partnership Interest - Fair Value Option
Assets:
Other long-term investments under fair value option	$ 795,583	$ 768,689