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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