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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Fixed-maturities available for sale, amortized cost | $ 5,360,398 | $ 5,498,422
Trading securities, amortized cost | 78,021 | 89,479
Equity securities, cost | 82,667 | 144,579
Reinvested cash collateral held under securities lending agreements | 118,649 | 125,723
Reinsurance recoverables, paid losses | $ 1,430 | $ 444
Common stock, par value (in usd per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 485,000 | 485,000
Common stock, shares, issued (in shares) | 156,876 | 168,350
Common stock, shares, outstanding (in shares) | 135,473 | 147,569
Treasury stock (in shares) | 21,403 | 20,782

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