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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              
Repurchase of shares     (1,369) (429)   (109,501)  
Exercise of options and issuance of restricted stock awards     337 162      
Change in noncontrolling interests       267      
Change in net unrealized gains on investments (7,572)       (7,572)    
Net income 235,356         235,356  
Net income attributable to noncontrolling interests (38,607)         (38,607)  
Dividends on common shares           (12,329)  
Dividends on preference shares (6,275)         (6,275)  
Noncontrolling interest             3,747
Total shareholders’ equity 3,566,852            
End of period at Mar. 31, 2013   400,000 44,510 0 6,050 3,112,545  
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              
Repurchase of shares     (2,978) 4,179   (278,252)  
Exercise of options and issuance of restricted stock awards     188 (4,144)      
Change in noncontrolling interests       (35)      
Change in net unrealized gains on investments (168)       (168)    
Net income 199,366         199,366  
Net income attributable to noncontrolling interests (42,768)         (42,768)  
Dividends on common shares           (11,899)  
Dividends on preference shares (5,595)         (5,595)  
Noncontrolling interest             0
Total shareholders’ equity 3,762,278            
End of period at Mar. 31, 2014 $ 3,762,278 $ 400,000 $ 40,856 $ 0 $ 3,963 $ 3,317,459