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Consolidated Statements Of Changes In Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Preference Shares
Common Shares
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings
Noncontrolling Interest
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) (1,722) 3,019   (142,208)  
Offering expenses       (9,345)      
Change in noncontrolling interests       622      
Exercise of options and issuance of restricted stock awards     571 5,704      
Change in net unrealized gains on investments (9,056)       (9,056)    
Net income 513,326         513,326  
Net income attributable to noncontrolling interests (96,953)         (96,953)  
Dividends on common shares           (36,956)  
Dividends on preference shares (19,353)         (19,353)  
Noncontrolling interest             3,720
Total shareholders’ equity 3,714,434            
End of period at Sep. 30, 2013   400,000 44,391 0 4,566 3,261,757  
Beginning of period at Dec. 31, 2013 3,904,384 400,000 43,646 0 4,131 3,456,607  
Statement of Changes in Stockholders' Equity              
Issuance of shares   0          
Repurchase of shares   0 (4,996) (5,359)   (468,200)  
Offering expenses       0      
Change in noncontrolling interests       1,118      
Exercise of options and issuance of restricted stock awards     238 4,241      
Change in net unrealized gains on investments (302)       (302)    
Net income 465,679         465,679  
Net income attributable to noncontrolling interests (109,323)         (109,323)  
Dividends on common shares           (34,834)  
Dividends on preference shares (16,786)         (16,786)  
Noncontrolling interest             0
Total shareholders’ equity 3,735,860            
End of period at Sep. 30, 2014 $ 3,735,860 $ 400,000 $ 38,888 $ 0 $ 3,829 $ 3,293,143