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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Preferred shares
Common shares (par value)
Additional paid-in capital
Accumulated other comprehensive income (loss)
Unrealized gains (losses) on available-for-sale investments, net of tax
Cumulative foreign currency translation adjustments, net of tax
Retained earnings
Treasury shares, at cost
Balance at beginning of year at Dec. 31, 2021   $ 550,000 $ 2,206 $ 2,346,179 $ 56,536 $ 62,155 $ (5,619) $ 6,204,745 $ (3,749,010)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (31,175)         32,720
Share-based compensation expense       51,249          
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ (805,850)         (805,850)      
Foreign currency translation adjustment (10,986)           (10,986)    
Net income 223,083             223,083  
Preferred share dividends [1]               (30,250)  
Common share dividends [1]               (150,556)  
Shares repurchased                 (48,981)
Balance at end of year at Dec. 31, 2022 4,639,910 550,000 2,206 2,366,253 (760,300) (743,695) (16,605) 6,247,022 (3,765,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (40,430)         42,135
Share-based compensation expense       57,207          
Unrealized gains (losses) arising during the year, net of reclassification adjustment 396,036         396,036      
Foreign currency translation adjustment (1,572)           (1,572)    
Net income 376,292             376,292  
Preferred share dividends [1]               (30,250)  
Common share dividends [1]               (152,536)  
Shares repurchased                 (23,596)
Balance at end of year at Dec. 31, 2023 5,263,196 550,000 2,206 2,383,030 (365,836) (347,659) (18,177) 6,440,528 (3,746,732)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (29,454)         31,698
Share-based compensation expense       40,487          
Unrealized gains (losses) arising during the year, net of reclassification adjustment 122,042         122,042      
Foreign currency translation adjustment (23,763)           (23,763)    
Net income 1,081,786             1,081,786  
Preferred share dividends [1]               (30,250)  
Common share dividends [1]               (150,495)  
Shares repurchased                 (215,868)
Balance at end of year at Dec. 31, 2024 $ 6,089,379 $ 550,000 $ 2,206 $ 2,394,063 $ (267,557) $ (225,617) $ (41,940) $ 7,341,569 $ (3,930,902)
[1] Refer to Note 15 'Shareholders' Equity' for details on dividends declared and paid related to the Company's common and preferred shares.