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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |
Fixed-maturities available for sale, amortized cost | $ 5,587,261 | $ 5,367,729
Trading securities, amortized cost | 122,472 | 234,382
Equity securities, amortized cost | 162,899 | 176,229
Reinvested cash collateral held under securities lending agreements | 99,735 | 48,652
Reinsurance recoverables, paid losses | $ 18 | $ 51
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) | 176,509 | 194,408
Common stock, shares, outstanding (in shares) | 157,056 | 175,421
Treasury stock (in shares) | 19,453 | 18,987

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