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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, 2017   $ 400,000 $ 40,024 $ 37,355 $ 224 $ 3,913,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares     0 0    
Exercise of options and issuance of restricted stock awards     222 1,141    
Change in redeemable noncontrolling interests       56    
Change in net unrealized (losses) gains on investments         (30)  
Net income $ 92,207         92,207
Net income attributable to redeemable noncontrolling interests (29,899)         (29,899)
Dividends on common shares (13,200)         (13,224)
Dividends on preference shares (5,595)         (5,595)
Ending balance at Mar. 31, 2018 4,436,253 400,000 40,246 38,552 194 3,957,261
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     1,739 248,259    
Exercise of options and issuance of restricted stock awards     213 (466)    
Change in redeemable noncontrolling interests       (3)    
Change in net unrealized (losses) gains on investments         (37)  
Net income 353,128         353,128
Net income attributable to redeemable noncontrolling interests (70,222)         (70,222)
Dividends on common shares (14,500)         (14,469)
Dividends on preference shares (9,189)          
Ending balance at Mar. 31, 2019 $ 5,554,033 $ 650,000 $ 44,159 $ 543,889 $ (1,470) $ 4,317,455