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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, 2017   $ 400,000 $ 40,024 $ 37,355 $ 224 $ 3,913,772
Statement of Changes in Stockholders' Equity            
Issuance of shares (Note 12)   250,000 1,947 248,053    
Repurchase of shares (Note 12)   0 0 0    
Offering expenses (Note 12)       (8,552)    
Change in redeemable noncontrolling interest       837    
Exercise of options and issuance of restricted stock awards (Notes 12 and 17)     236 18,406    
Change in net unrealized gains on investments, net of tax $ (1,657)       (1,657)  
Foreign currency translation adjustments, net of tax 0          
Net income 268,917          
Net income attributable to redeemable noncontrolling interests (Note 10) (41,553)         (41,553)
Dividends on common shares (Note 12) (52,800)         (52,841)
Dividends on preference shares (Note 12) (30,088)         (30,088)
Ending balance at Dec. 31, 2018 5,045,080 650,000 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 on investments, net of tax 2,173       2,173  
Foreign currency translation adjustments, net of tax (2,679)       (2,679)  
Net income 950,267          
Net income 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 on investments, net of tax 606       606  
Foreign currency translation adjustments, net of tax (11,309)       (11,309)  
Net income 993,058          
Net income 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