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Condensed Consolidated Statements of Changes in Common Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2023   $ 173 $ (945,870) $ 1,430,594 $ 4,243,759 $ (330,851)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   2   3,592    
Share-based compensation       31,025    
Shares repurchased under share repurchase program, net of excise tax (Note 14)   (4)   (150,165)    
Repurchases of common stock under incentive plans     (21,847)      
Net income $ 456,149       456,149  
Dividends and dividend equivalents declared         (115,455)  
Net unrealized gains (losses) on investments, net of tax 97,627         97,819 [1]
Other adjustments to other comprehensive income (loss)           (68)
Balance, end of period at Sep. 30, 2024 4,698,853 171 (967,717) 1,315,046 4,584,453 (233,100)
Balance, beginning of period at Jun. 30, 2024   172 (967,218) 1,356,341 4,470,335 (377,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   0   1,205    
Share-based compensation       6,985    
Shares repurchased under share repurchase program, net of excise tax (Note 14)   (1)   (49,485)    
Repurchases of common stock under incentive plans     (499)      
Net income 151,892       151,892  
Dividends and dividend equivalents declared         (37,774)  
Net unrealized gains (losses) on investments, net of tax 144,053         144,211 [1]
Other adjustments to other comprehensive income (loss)           0
Balance, end of period at Sep. 30, 2024 4,698,853 171 (967,717) 1,315,046 4,584,453 (233,100)
Balance, beginning of period at Dec. 31, 2024 4,623,858 168 (968,246) 1,246,826 4,695,348 (350,238)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   2   3,612    
Share-based compensation       38,837    
Shares repurchased under share repurchase program, net of excise tax (Note 14)   (13)   (433,955)    
Repurchases of common stock under incentive plans     (21,106)      
Net income 427,797       427,797  
Dividends and dividend equivalents declared         (110,403)  
Net unrealized gains (losses) on investments, net of tax 123,416         123,775 [1]
Other adjustments to other comprehensive income (loss)           45
Balance, end of period at Sep. 30, 2025 4,652,449 157 (989,352) 855,320 5,012,742 (226,418)
Balance, beginning of period at Jun. 30, 2025   157 (988,764) 847,399 4,906,830 (272,941)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   0   1,774    
Share-based compensation       6,135    
Shares repurchased under share repurchase program, net of excise tax (Note 14)   0   12    
Repurchases of common stock under incentive plans     (588)      
Net income 141,443       141,443  
Dividends and dividend equivalents declared         (35,531)  
Net unrealized gains (losses) on investments, net of tax 46,344         46,523 [1]
Other adjustments to other comprehensive income (loss)           0
Balance, end of period at Sep. 30, 2025 $ 4,652,449 $ 157 $ (989,352) $ 855,320 $ 5,012,742 $ (226,418)
[1] Includes net unrealized gains (losses) from investments recorded as assets held for sale.