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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 loss
Retained earnings
Beginning balance at Dec. 31, 2019   $ 650,000 $ 44,148 $ 568,277 $ (1,939) $ 4,710,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   (125,000) (406) (62,215)    
Issuance of shares   0 6,777 1,088,730    
Issuance of restricted stock awards     291 20,889    
Offering expenses       0    
Change in redeemable noncontrolling interests       (353)    
Change in net unrealized gains (losses) on investments, net of tax $ 41       41  
Foreign currency translation adjustments, net of tax (185)       (185)  
Net (loss) income 801,424          
Net loss (income) attributable to redeemable noncontrolling interests (236,120)         (236,120)
Dividends on common shares (50,800)         (50,785)
Dividends on preference shares (23,634)         (23,634)
Ending balance at Sep. 30, 2020 7,390,821 525,000 50,810 1,615,328 (2,083) 5,201,766
Beginning balance at Jun. 30, 2020   525,000 50,811 1,602,738 (3,066) 5,171,689
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   0 0 0    
Issuance of shares   0 0 (42)    
Issuance of restricted stock awards     (1) 12,632    
Offering expenses       0    
Change in redeemable noncontrolling interests       0    
Change in net unrealized gains (losses) on investments, net of tax 2,186       2,186  
Foreign currency translation adjustments, net of tax (1,203)       (1,203)  
Net (loss) income 74,389          
Net loss (income) attributable to redeemable noncontrolling interests (19,301)         (19,301)
Dividends on common shares           (17,722)
Dividends on preference shares (7,289)         (7,289)
Ending balance at Sep. 30, 2020 7,390,821 525,000 50,810 1,615,328 (2,083) 5,201,766
Beginning balance at Dec. 31, 2020 7,560,248 525,000 50,811 1,623,206 (12,642) 5,373,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   (275,000) (4,503) (699,962)    
Issuance of shares   500,000 0 0    
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 (loss) income (391,716)          
Net loss (income) 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]            
Repurchase of shares   (275,000) (1,483) (222,322)    
Issuance of shares   500,000 0 0    
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 (loss) income (638,872)          
Net loss (income) 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