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Schedule II - Financial Information of Registrant - Parent Company Balance Sheet (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Investments |  |  |  |
Fixed-maturities available for sale—at fair value (amortized cost of $747,309 and $485,727) | $ 5,017,711 | $ 5,517,078 |  |
Equity securities—at fair value (cost of $140,733) | 148,965 | 184,245 |  |
Other invested assets—at fair value | 5,511 | 4,165 |  |
Short-term investments—at fair value (includes $61,328 and $1,058 of reinvested cash collateral held under securities lending agreements) | 402,090 | 551,508 |  |
Total investments | 5,693,491 | 6,513,542 |  |
Cash | 56,183 | 151,145 |  |
Investment in subsidiaries, at equity in net assets (Note C) | 4,300,000 |  |  |
Accounts and notes receivable (Note C) | 119,834 | 124,016 |  |
Other assets (Note C) | 427,024 | 483,180 |  |
Total assets | 7,063,729 | 7,839,185 |  |
Liabilities |  |  |  |
Senior notes | 1,413,504 | 1,409,473 |  |
Net deferred tax liability (Note A) | 391,083 | 337,509 |  |
Other liabilities (Note C) | 333,604 | 296,614 |  |
Total liabilities | 3,144,402 | 3,580,389 |  |
Common stockholders’ equity |  |  |  |
Common stock ($0.001 par value; 485,000 shares authorized; 2022: 176,509 and 157,056 shares issued and outstanding, respectively; 2021: 194,408 and 175,421 shares issued and outstanding, respectively) | 176 | 194 |  |
Treasury stock, at cost (2022: 19,453 shares; 2021: 18,987 shares) | (930,643) | (920,798) |  |
Additional paid-in capital | 1,519,641 | 1,878,372 |  |
Retained earnings | 3,786,952 | 3,180,935 |  |
Accumulated other comprehensive income (loss) | (456,799) | 120,093 |  |
Total common stockholders’ equity | 3,919,327 | 4,258,796 | $ 4,284,353 |
Total liabilities and stockholders’ equity | 7,063,729 | 7,839,185 |  |
Balance Sheet Parentheticals [Abstract] |  |  |  |
Fixed-maturities available for sale, amortized cost | 5,587,261 | 5,367,729 |  |
Equity securities, amortized cost | 162,899 | 176,229 |  |
Reinvested cash collateral held under securities lending agreements | $ 99,735 | $ 48,652 |  |
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 | 191,606 | 201,164
Treasury stock (in shares) | 19,453 | 18,987 |  |
Parent Company |  |  |  |
Investments |  |  |  |
Fixed-maturities available for sale—at fair value (amortized cost of $747,309 and $485,727) | $ 675,948 | $ 481,659 |  |
Equity securities—at fair value (cost of $140,733) | 140,804 | 0 |  |
Other invested assets—at fair value | 3,958 | 3,511 |  |
Short-term investments—at fair value (includes $61,328 and $1,058 of reinvested cash collateral held under securities lending agreements) | 108,232 | 120,601 |  |
Total investments | 928,942 | 605,771 |  |
Cash | 1,872 | 38,846 |  |
Investment in subsidiaries, at equity in net assets (Note C) | 4,576,644 | 5,210,917 |  |
Accounts and notes receivable (Note C) | 657 | 100,002 |  |
Other assets (Note C) | 157,370 | 65,923 |  |
Total assets | 5,665,485 | 6,021,459 |  |
Liabilities |  |  |  |
Senior notes | 1,413,504 | 1,409,473 |  |
Net deferred tax liability (Note A) | 196,829 | 283,585 |  |
Other liabilities (Note C) | 135,825 | 69,605 |  |
Total liabilities | 1,746,158 | 1,762,663 |  |
Common stockholders’ equity |  |  |  |
Common stock ($0.001 par value; 485,000 shares authorized; 2022: 176,509 and 157,056 shares issued and outstanding, respectively; 2021: 194,408 and 175,421 shares issued and outstanding, respectively) | 176 | 194 |  |
Treasury stock, at cost (2022: 19,453 shares; 2021: 18,987 shares) | (930,643) | (920,798) |  |
Additional paid-in capital | 1,519,641 | 1,878,372 |  |
Retained earnings | 3,786,952 | 3,180,935 |  |
Accumulated other comprehensive income (loss) | (456,799) | 120,093 |  |
Total common stockholders’ equity | 3,919,327 | 4,258,796 |  |
Total liabilities and stockholders’ equity | 5,665,485 | 6,021,459 |  |
Balance Sheet Parentheticals [Abstract] |  |  |  |
Fixed-maturities available for sale, amortized cost | 747,309 | 485,727 |  |
Equity securities, amortized cost | 140,733 |  |  |
Reinvested cash collateral held under securities lending agreements | $ 61,328 | $ 1,058 |  |

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