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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) (1,498) (2,978)   (117,520)  
Offering expenses       (9,345)      
Change in noncontrolling interests       499      
Exercise of options and issuance of restricted stock awards     341 11,824      
Change in net unrealized gains on investments (8,713)       (8,713)    
Net income 283,660         283,660  
Net income attributable to noncontrolling interests (52,622)         (52,622)  
Dividends on common shares           (24,658)  
Dividends on preference shares (13,758)         (13,758)  
Noncontrolling interest             3,693
Total shareholders’ equity 3,571,990            
End of period at Jun. 30, 2013   400,000 44,385 0 4,909 3,119,003  
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 (3,363) 2,139   (313,312)  
Offering expenses       0      
Change in noncontrolling interests       43      
Exercise of options and issuance of restricted stock awards     240 (2,182)      
Change in net unrealized gains on investments (213)       (213)    
Net income 361,792         361,792  
Net income attributable to noncontrolling interests (78,846)         (78,846)  
Dividends on common shares           (23,550)  
Dividends on preference shares (11,191)         (11,191)  
Noncontrolling interest             0
Total shareholders’ equity 3,835,941            
End of period at Jun. 30, 2014 $ 3,835,941 $ 400,000 $ 40,523 $ 0 $ 3,918 $ 3,391,500