CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cost	$ 16,053	$ 16,025
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	371,353,000	371,353,000
Common stock, shares outstanding (in shares)	268,990,000	272,494,000
Treasury stock at cost (in shares)	102,363,000	98,859,000
Fixed income
Fixed maturities, amortized cost	$ 5,928,057	$ 5,939,483
Short-Term Investments
Fixed maturities, amortized cost	$ 95,721	$ 121,539