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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, 2021   $ 194 $ (920,798) $ 1,878,372 $ 3,180,935 $ 120,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   2   3,163    
Shares repurchased under share repurchase program (Note 14)   (20)   (399,200)    
Repurchases of common stock under incentive plans     (9,598)      
Share-based compensation       31,280    
Net income $ 580,604       580,604  
Dividends and dividend equivalents declared         (104,669)  
Net unrealized gains (losses) on investments, net of tax (622,392)         (622,392)
Other adjustments to other comprehensive income (loss)           84
Balance, end of period at Sep. 30, 2022 3,738,050 176 (930,396) 1,513,615 3,656,870 (502,215)
Balance, beginning of period at Jun. 30, 2022   186 (930,284) 1,698,490 3,491,675 (329,105)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   0   1,525    
Shares repurchased under share repurchase program (Note 14)   (10)   (194,114)    
Repurchases of common stock under incentive plans     (112)      
Share-based compensation       7,714    
Net income 198,280       198,280  
Dividends and dividend equivalents declared         (33,085)  
Net unrealized gains (losses) on investments, net of tax (173,110)         (173,110)
Other adjustments to other comprehensive income (loss)           0
Balance, end of period at Sep. 30, 2022 3,738,050 176 (930,396) 1,513,615 3,656,870 (502,215)
Balance, beginning of period at Dec. 31, 2022 3,919,327 176 (930,643) 1,519,641 3,786,952 (456,799)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   2   3,951    
Shares repurchased under share repurchase program (Note 14)   (3)   (70,444)    
Repurchases of common stock under incentive plans     (14,861)      
Share-based compensation       29,564    
Net income 460,426       460,426  
Dividends and dividend equivalents declared         (110,780)  
Net unrealized gains (losses) on investments, net of tax (64,462)         (64,462)
Other adjustments to other comprehensive income (loss)           179
Balance, end of period at Sep. 30, 2023 4,152,899 175 (945,504) 1,482,712 4,136,598 (521,082)
Balance, beginning of period at Jun. 30, 2023   177 (945,032) 1,522,895 4,016,482 (423,686)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under incentive and benefit plans   0   1,094    
Shares repurchased under share repurchase program (Note 14)   (2)   (50,436)    
Repurchases of common stock under incentive plans     (472)      
Share-based compensation       9,159    
Net income 156,582       156,582  
Dividends and dividend equivalents declared         (36,466)  
Net unrealized gains (losses) on investments, net of tax (97,396)         (97,396)
Other adjustments to other comprehensive income (loss)           0
Balance, end of period at Sep. 30, 2023 $ 4,152,899 $ 175 $ (945,504) $ 1,482,712 $ 4,136,598 $ (521,082)