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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   250,000 0 0    
Offering expenses       (8,498)    
Change in redeemable noncontrolling interests       327    
Exercise of options and issuance of restricted stock awards     239 5,910    
Change in net unrealized gains on investments, net of tax $ (1,325)       (1,325)  
Foreign currency translation adjustments, net of tax 0       0  
Net income 344,074         344,074
Net income attributable to redeemable noncontrolling interests (84,382)         (84,382)
Dividends on common shares (26,500)         (26,468)
Dividends on preference shares (11,191)         (11,191)
Ending balance at Jun. 30, 2018 4,860,061 650,000 40,263 35,094 (1,101) 4,135,805
Beginning balance at Mar. 31, 2018   400,000 40,246 38,552 194 3,957,261
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   250,000 0 0    
Offering expenses       (8,498)    
Change in redeemable noncontrolling interests       271    
Exercise of options and issuance of restricted stock awards     17 4,769    
Change in net unrealized gains on investments, net of tax (1,295)       (1,295)  
Foreign currency translation adjustments, net of tax 0       0  
Net income 251,867         251,867
Net income attributable to redeemable noncontrolling interests (54,483)         (54,483)
Dividends on common shares           (13,244)
Dividends on preference shares (5,596)         (5,596)
Ending balance at Jun. 30, 2018 4,860,061 650,000 40,263 35,094 (1,101) 4,135,805
Beginning balance at Dec. 31, 2018 5,045,080 650,000 42,207 296,099 (1,433) 4,058,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 1,739 248,259    
Offering expenses       0    
Change in redeemable noncontrolling interests       (216)    
Exercise of options and issuance of restricted stock awards     216 8,068    
Change in net unrealized 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)          
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 0    
Offering expenses       0    
Change in redeemable noncontrolling interests       (213)    
Exercise of options and issuance of restricted stock awards     3 8,534    
Change in net unrealized 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)          
Ending balance at Jun. 30, 2019 $ 5,912,842 $ 650,000 $ 44,162 $ 552,210 $ (3,869) $ 4,670,339