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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) income
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     206 16,169    
Change in redeemable noncontrolling interests       (361)    
Change in net unrealized losses on investments, net of tax $ 1,880       1,880  
Foreign currency translation adjustments, net of tax 4,541       4,541  
Net income 909,927          
Net income attributable to redeemable noncontrolling interests (204,091)         (204,091)
Dividends on common shares (44,500)         (44,547)
Dividends on preference shares (27,567)         (27,567)
Ending balance at Sep. 30, 2019 5,951,235 650,000 44,152 560,166 4,988 4,691,929
Beginning balance at Jun. 30, 2019   650,000 44,162 552,210 (3,869) 4,670,339
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     (10) 8,101    
Change in redeemable noncontrolling interests       (145)    
Change in net unrealized losses on investments, net of tax 608       608  
Foreign currency translation adjustments, net of tax 8,249       8,249  
Net income 107,944          
Net income attributable to redeemable noncontrolling interests (62,057)         (62,057)
Dividends on common shares           (15,108)
Dividends on preference shares (9,189)         (9,189)
Ending balance at Sep. 30, 2019 5,951,235 650,000 44,152 560,166 4,988 4,691,929
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 1,088,730    
Repurchase of shares   (125,000) (406) (62,215)    
Exercise of options and issuance of restricted stock awards     291 20,889    
Change in redeemable noncontrolling interests       (353)    
Change in net unrealized losses on investments, net of tax 41       41  
Foreign currency translation adjustments, net of tax (185)       (185)  
Net income 801,424          
Net 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]            
Issuance of shares     0 (42)    
Repurchase of shares   0 0 0    
Exercise of options and issuance of restricted stock awards     (1) 12,632    
Change in redeemable noncontrolling interests       0    
Change in net unrealized losses on investments, net of tax 2,186       2,186  
Foreign currency translation adjustments, net of tax (1,203)       (1,203)  
Net income 74,389          
Net 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