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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Shareholders' equity: |  |
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) | 272,494,000 | 293,433,000
Treasury stock, shares at cost (in shares) | 98,859,000 | 77,920,000
Fixed income |  |
Fixed income, amortized cost | $ 5,939,483 | $ 5,859,688
Short-Term Investments |  |
Fixed income, amortized cost | 121,539 | 67,097
Equity securities |  |
Cost | $ 16,025 | $ 15,924

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