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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     6,777 1,088,772    
Issuance of restricted stock awards     292 8,257    
Change in redeemable noncontrolling interests       (353)    
Change in net unrealized losses on investments, net of tax $ (2,145)       (2,145)  
Foreign currency translation adjustments, net of tax 1,018       1,018  
Net income 727,035          
Net income attributable to redeemable noncontrolling interests (216,819)         (216,819)
Dividends on common shares (33,100)         (33,063)
Dividends on preference shares (16,345)         (16,345)
Ending balance at Jun. 30, 2020 7,347,172 525,000 50,811 1,602,738 (3,066) 5,171,689
Beginning balance at Mar. 31, 2020   525,000 44,034 502,608 (1,664) 4,613,548
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   0 0 0    
Issuance of shares     6,777 1,088,772    
Issuance of restricted stock awards     0 11,362    
Change in redeemable noncontrolling interests       (4)    
Change in net unrealized losses on investments, net of tax (1,488)       (1,488)  
Foreign currency translation adjustments, net of tax 86       86  
Net income 701,862          
Net income attributable to redeemable noncontrolling interests (118,728)         (118,728)
Dividends on common shares           (17,704)
Dividends on preference shares (7,289)         (7,289)
Ending balance at Jun. 30, 2020 7,347,172 525,000 50,811 1,602,738 (3,066) 5,171,689
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   0 (3,020) (477,640)    
Issuance of shares     0 0    
Issuance of restricted stock awards     235 11,005    
Change in redeemable noncontrolling interests       (2,690)    
Change in net unrealized losses on investments, net of tax (2,833)       (2,833)  
Foreign currency translation adjustments, net of tax 1,414       1,414  
Net income 247,156          
Net income attributable to redeemable noncontrolling interests (66,694)         (66,694)
Dividends on common shares (35,000)         (34,997)
Dividends on preference shares (14,578)         (14,578)
Ending balance at Jun. 30, 2021 7,217,606 525,000 48,026 1,153,881 (14,061) 5,504,760
Beginning balance at Mar. 31, 2021   525,000 49,970 1,450,627 (12,382) 5,065,122
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   0 (1,944) (307,071)    
Issuance of shares     0 0    
Issuance of restricted stock awards     0 11,150    
Change in redeemable noncontrolling interests       (825)    
Change in net unrealized losses on investments, net of tax (1,022)       (1,022)  
Foreign currency translation adjustments, net of tax (657)       (657)  
Net income 577,651          
Net income attributable to redeemable noncontrolling interests (113,544)         (113,544)
Dividends on common shares           (17,180)
Dividends on preference shares (7,289)         (7,289)
Ending balance at Jun. 30, 2021 $ 7,217,606 $ 525,000 $ 48,026 $ 1,153,881 $ (14,061) $ 5,504,760