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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, 2018   $ 650,000 $ 42,207 $ 296,099 $ (1,433) $ 4,058,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares     1,739 248,259    
Repurchase of shares   0 0 0    
Exercise of options and issuance of restricted stock awards     216 8,068    
Change in redeemable noncontrolling interests       (216)    
Change in net unrealized (losses) gains on investments, net of tax $ 1,272       1,272  
Foreign currency translation adjustments, net of tax (3,708)       (3,708)  
Net income 801,983         801,983
Net income attributable to redeemable noncontrolling interests (142,034)         (142,034)
Dividends on common shares (29,400)         (29,439)
Dividends on preference shares (18,378)         (18,378)
Ending balance at Jun. 30, 2019 5,912,842 650,000 44,162 552,210 (3,869) 4,670,339
Beginning balance at Mar. 31, 2019   650,000 44,159 543,889 (1,470) 4,317,455
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares     0 0    
Repurchase of shares   0 0 0    
Exercise of options and issuance of restricted stock awards     3 8,534    
Change in redeemable noncontrolling interests       (213)    
Change in net unrealized (losses) gains on investments, net of tax 1,309       1,309  
Foreign currency translation adjustments, net of tax (3,708)       (3,708)  
Net income 448,855         448,855
Net income attributable to redeemable noncontrolling interests (71,812)         (71,812)
Dividends on common shares           (14,970)
Dividends on preference shares (9,189)         (9,189)
Ending balance at Jun. 30, 2019 5,912,842 650,000 44,162 552,210 (3,869) 4,670,339
Beginning balance at Dec. 31, 2019 5,971,367 650,000 44,148 568,277 (1,939) 4,710,881
Ending balance at Mar. 31, 2020   525,000 44,034 502,608 (1,664) 4,613,548
Beginning balance at Dec. 31, 2019 5,971,367 650,000 44,148 568,277 (1,939) 4,710,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares     6,777 1,088,772    
Repurchase of shares   (125,000) (406) (62,215)    
Exercise of options and issuance of restricted stock awards     292 8,257    
Change in redeemable noncontrolling interests       (353)    
Change in net unrealized (losses) gains on investments, net of tax (2,145)       (2,145)  
Foreign currency translation adjustments, net of tax 1,018       1,018  
Net income 727,035         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]            
Issuance of shares     6,777 1,088,772    
Repurchase of shares   0 0 0    
Exercise of options and issuance of restricted stock awards     0 11,362    
Change in redeemable noncontrolling interests       (4)    
Change in net unrealized (losses) gains on investments, net of tax (1,488)       (1,488)  
Foreign currency translation adjustments, net of tax 86       86  
Net income 701,862         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