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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Preference shares
Common stock
Additional paid-in capital
Accumulated other comprehensive income
Retained earnings
Issuance of shares     $ 0 $ 0    
Beginning of period at Dec. 31, 2012   $ 400,000 45,542 0 $ 13,622 $ 3,043,901
Statement of Changes in Stockholders' Equity            
Issuance of shares   275,000        
Repurchase of shares   (275,000) (2,451) (1,702)   (203,703)
Offering expenses       (9,144)    
Change in redeemable noncontrolling interest       318    
Exercise of options and issuance of restricted stock awards     555 10,528    
Change in net unrealized gains on investments $ 9,491       (9,491)  
Net income 841,768         841,768
Net income attributable to noncontrolling interests (151,144)         (151,144)
Dividends on common shares           (49,267)
Dividends on preference shares (24,948)         (24,948)
End of period at Dec. 31, 2013   400,000 43,646 0 4,131 3,456,607
Statement of Changes in Stockholders' Equity            
Total shareholders’ equity 3,904,384          
Issuance of shares     0 0    
Issuance of shares   0        
Repurchase of shares   0 (5,355) (11,702)   (497,175)
Offering expenses       0    
Change in redeemable noncontrolling interest       1,274    
Exercise of options and issuance of restricted stock awards     151 10,428    
Change in net unrealized gains on investments 715       (715)  
Net income 686,256         686,256
Net income attributable to noncontrolling interests (153,538)         (153,538)
Dividends on common shares           (45,912)
Dividends on preference shares (22,381)         (22,381)
End of period at Dec. 31, 2014 3,865,715 400,000 38,442 0 3,416 3,423,857
Statement of Changes in Stockholders' Equity            
Total shareholders’ equity 3,865,715          
Issuance of shares     7,435 754,384    
Issuance of shares   0        
Repurchase of shares   0 (2,473) (257,401)   0
Offering expenses       0    
Change in redeemable noncontrolling interest       (762)    
Exercise of options and issuance of restricted stock awards     297 11,453    
Change in net unrealized gains on investments 1,308       (1,308)  
Net income 542,242         542,242
Net income attributable to noncontrolling interests (111,050)         (111,050)
Dividends on common shares           (53,967)
Dividends on preference shares (22,381)         (22,381)
End of period at Dec. 31, 2015 4,732,184 $ 400,000 $ 43,701 $ 507,674 $ 2,108 $ 3,778,701
Statement of Changes in Stockholders' Equity            
Total shareholders’ equity $ 4,732,184