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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Investments |  |  |  |
Fixed-maturities available for sale-at fair value (amortized cost of $634,133 and $653,575) | $ 5,074,920 | $ 5,188,228 |  |
Trading securities-at fair value (amortized cost of $3,987) | 82,652 | 106,423 |  |
Equity securities-at fair value (cost of $126,830 and $79,170) | 138,189 | 89,057 |  |
Short-term investments-at fair value (includes $6,276 and $63,450 of reinvested cash collateral held under securities lending agreements) | 521,648 | 660,566 |  |
Total investments | 6,345,236 | 6,085,654 |  |
Cash | 38,823 | 18,999 |  |
Investment in subsidiaries, at equity in net assets (Note C) | 4,600,000 |  |  |
Other assets | 375,931 | 459,805 |  |
Total assets | 8,663,988 | 7,593,933 |  |
Liabilities |  |  |  |
Senior notes | 1,065,337 | 1,417,781 |  |
Net deferred tax liability (Note A) | 746,685 | 589,564 |  |
Other liabilities | 431,556 | 473,763 |  |
Total liabilities | 4,040,130 | 3,196,128 |  |
Common stockholders’ equity |  |  |  |
Treasury stock, at cost (2024: 20,782 shares; 2023: 20,068 shares) | (968,246) | (945,870) |  |
Additional paid-in capital | 1,246,826 | 1,430,594 |  |
Retained earnings | 4,695,348 | 4,243,759 |  |
Accumulated other comprehensive income (loss) | (350,238) | (330,851) |  |
Total stockholders’ equity | 4,623,858 | 4,397,805 | $ 3,919,327 |
Total liabilities and stockholders’ equity | 8,663,988 | 7,593,933 |  |
Balance Sheet Parentheticals [Abstract] |  |  |  |
Fixed-maturities available for sale, amortized cost | 5,511,501 | 5,599,111 |  |
Trading securities, amortized cost | 89,479 | 110,484 |  |
Equity securities, amortized cost | 144,579 | 92,124 |  |
Reinvested cash collateral held under securities lending agreements | $ 125,723 | $ 149,364 |  |
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) | 168,350 | 173,247 |  |
Common stock, shares, outstanding (in shares) | 147,569 | 153,179 | 157,056 | 175,421
Treasury stock (in shares) | 20,782 | 20,068 |  |
Parent Company |  |  |  |
Investments |  |  |  |
Fixed-maturities available for sale-at fair value (amortized cost of $634,133 and $653,575) | $ 612,209 | $ 623,957 |  |
Trading securities-at fair value (amortized cost of $3,987) | 4,838 |  |  |
Equity securities-at fair value (cost of $126,830 and $79,170) | 134,864 | 83,620 |  |
Other invested assets-at fair value | 4,850 | 6,222 |  |
Short-term investments-at fair value (includes $6,276 and $63,450 of reinvested cash collateral held under securities lending agreements) | 115,983 | 316,991 |  |
Total investments | 872,744 | 1,030,790 |  |
Cash | 5,782 | 2,200 |  |
Investment in subsidiaries, at equity in net assets (Note C) | 5,012,554 | 4,990,822 |  |
Other assets | 131,345 | 165,612 |  |
Total assets | 6,022,425 | 6,189,424 |  |
Liabilities |  |  |  |
Senior notes | 1,065,337 | 1,417,781 |  |
Net deferred tax liability (Note A) | 245,692 | 226,141 |  |
Other liabilities | 87,538 | 147,697 |  |
Total liabilities | 1,398,567 | 1,791,619 |  |
Common stockholders’ equity |  |  |  |
Common stock ($0.001 par value; 485,000 shares authorized; 2024: 168,350 and 147,569 shares issued and outstanding, respectively; 2023: 173,247 and 153,179 shares issued and outstanding, respectively) | 168 | 173 |  |
Treasury stock, at cost (2024: 20,782 shares; 2023: 20,068 shares) | (968,246) | (945,870) |  |
Additional paid-in capital | 1,246,826 | 1,430,594 |  |
Retained earnings | 4,695,348 | 4,243,759 |  |
Accumulated other comprehensive income (loss) | (350,238) | (330,851) |  |
Total stockholders’ equity | 4,623,858 | 4,397,805 |  |
Total liabilities and stockholders’ equity | 6,022,425 | 6,189,424 |  |
Balance Sheet Parentheticals [Abstract] |  |  |  |
Fixed-maturities available for sale, amortized cost | 634,133 | 653,575 |  |
Trading securities, amortized cost | 3,987 |  |  |
Equity securities, amortized cost | 126,830 | 79,170 |  |
Reinvested cash collateral held under securities lending agreements | $ 6,276 | $ 63,450 |  |

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