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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preference shares
Common shares
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Beginning balance at Dec. 31, 2020   $ 525,000 $ 50,811 $ 1,623,206 $ (12,642) $ 5,373,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   500,000        
Repurchase of shares   (275,000) (4,503) (699,962)    
Issuance of restricted stock awards     232 22,081    
Offering expenses       (11,111)    
Change in redeemable noncontrolling interests       (6,352)    
Change in net unrealized gains (losses) on investments, net of tax $ (2,827)       (2,827)  
Foreign currency translation adjustments, net of tax 2,760       2,760  
Net income (loss) (391,716)          
Net (income) loss attributable to redeemable noncontrolling interests 131,801         131,801
Dividends on common shares (51,700)         (51,714)
Dividends on preference shares (24,423)         (24,423)
Ending balance at Sep. 30, 2021 6,749,514 750,000 46,540 927,862 (12,709) 5,037,821
Beginning balance at Jun. 30, 2021   525,000 48,026 1,153,881 (14,061) 5,504,760
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   500,000        
Repurchase of shares   (275,000) (1,483) (222,322)    
Issuance of restricted stock awards     (3) 11,076    
Offering expenses       (11,111)    
Change in redeemable noncontrolling interests       (3,662)    
Change in net unrealized gains (losses) on investments, net of tax 6       6  
Foreign currency translation adjustments, net of tax 1,346       1,346  
Net income (loss) (638,872)          
Net (income) loss attributable to redeemable noncontrolling interests 198,495         198,495
Dividends on common shares           (16,717)
Dividends on preference shares (9,845)         (9,845)
Ending balance at Sep. 30, 2021 6,749,514 750,000 46,540 927,862 (12,709) 5,037,821
Beginning balance at Dec. 31, 2021 6,624,281 750,000 44,445 608,121 (10,909) 5,232,624
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (1,051) (161,788)    
Issuance of restricted stock awards     308 23,240    
Change in redeemable noncontrolling interests       (4,008)    
Change in net unrealized gains (losses) on investments, net of tax (3,749)       (3,749)  
Foreign currency translation adjustments, net of tax (2,115)       (2,115)  
Net income (loss) (1,853,149)          
Net (income) loss attributable to redeemable noncontrolling interests 335,010         335,010
Dividends on common shares (48,600)         (48,576)
Dividends on preference shares (26,531)         (26,531)
Ending balance at Sep. 30, 2022 4,881,872 750,000 43,702 465,565 (16,773) 3,639,378
Beginning balance at Jun. 30, 2022   750,000 43,881 479,085 (15,168) 4,480,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (176) (25,132)    
Issuance of restricted stock awards     (3) 11,631    
Change in redeemable noncontrolling interests       (19)    
Change in net unrealized gains (losses) on investments, net of tax (1,332)       (1,332)  
Foreign currency translation adjustments, net of tax (273)       (273)  
Net income (loss) (1,188,930)          
Net (income) loss attributable to redeemable noncontrolling interests 372,429         372,429
Dividends on common shares           (16,139)
Dividends on preference shares (8,843)         (8,843)
Ending balance at Sep. 30, 2022 $ 4,881,872 $ 750,000 $ 43,702 $ 465,565 $ (16,773) $ 3,639,378