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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Fixed income, amortized cost | $ 5,562,550 | $ 5,196,784
Equity securities, cost | $ 17,188 | $ 3,993
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) | 347,308,000 | 355,371,000
Treasury stock, shares at cost (in shares) | 24,045,000 | 15,982,000

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