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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, 2018   $ 650,000 $ 42,207 $ 296,099 $ (1,433) $ 4,058,207
Statement of Changes in Stockholders' Equity            
Issuance of shares (Note 12)   0 1,739 248,259    
Repurchase of shares (Note 12)   0 0 0    
Offering expenses (Note 12)       0    
Change in redeemable noncontrolling interest       (342)    
Exercise of options and issuance of restricted stock awards (Notes 12 and 17)     202 24,261    
Change in net unrealized gains (loss) on investments, net of tax $ 2,173       2,173  
Foreign currency translation adjustments, net of tax (2,679)          
Net income (loss) 950,267          
Net (income) loss attributable to redeemable noncontrolling interests (Note 10) (201,469)         (201,469)
Dividends on common shares (Note 12) (59,400)         (59,368)
Dividends on preference shares (Note 12) (36,756)         (36,756)
Ending balance at Dec. 31, 2019 5,971,367 650,000 44,148 568,277 (1,939) 4,710,881
Statement of Changes in Stockholders' Equity            
Issuance of shares (Note 12)   0 6,777 1,088,730    
Repurchase of shares (Note 12)   (125,000) (406) (62,215)    
Offering expenses (Note 12)       0    
Change in redeemable noncontrolling interest       (334)    
Exercise of options and issuance of restricted stock awards (Notes 12 and 17)     292 28,748    
Change in net unrealized gains (loss) on investments, net of tax 606       606  
Foreign currency translation adjustments, net of tax (11,309)       (11,309)  
Net income (loss) 993,058          
Net (income) loss attributable to redeemable noncontrolling interests (Note 10) (230,653)         (230,653)
Dividends on common shares (Note 12) (68,500)         (68,490)
Dividends on preference shares (Note 12) (30,923)         (30,923)
Ending balance at Dec. 31, 2020 7,560,248 525,000 50,811 1,623,206 (12,642) 5,373,873
Statement of Changes in Stockholders' Equity            
Issuance of shares (Note 12)   500,000 0 0    
Repurchase of shares (Note 12)   (275,000) (6,579) (1,024,751)    
Offering expenses (Note 12)       (11,347)    
Change in redeemable noncontrolling interest       (6,994)    
Exercise of options and issuance of restricted stock awards (Notes 12 and 17)     213 28,007    
Change in net unrealized gains (loss) on investments, net of tax (2,492)       (2,492)  
Foreign currency translation adjustments, net of tax 4,225       4,225  
Net income (loss) (103,440)          
Net (income) loss attributable to redeemable noncontrolling interests (Note 10) 63,285         63,285
Dividends on common shares (Note 12) (67,800)         (67,828)
Dividends on preference shares (Note 12) (33,266)         (33,266)
Ending balance at Dec. 31, 2021 $ 6,624,281 $ 750,000 $ 44,445 $ 608,121 $ (10,909) $ 5,232,624