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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Parent [Member]
Preferred shares [Member]
Common shares (par value) [Member]
Additional paid-in capital [Member]
Accumulated other comprehensive income (loss) [Member]
Unrealized gains (losses) on available for sale investments, net of tax [Member]
Cumulative foreign currency translation adjustments, net of tax [Member]
Retained earnings [Member]
Treasury shares, at cost [Member]
Noncontrolling interest [Member]
Total shareholders' equity at Dec. 31, 2012     $ 502,843 $ 2,146 $ 2,179,034 $ 362,622 $ 348,328 $ 14,294 $ 4,497,789 $ (1,764,673)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares issued     225,000 28 3,422            
Cost of treasury shares reissued         (4,225)         4,225  
Issue costs on newly issued preferred shares         (6,551)            
Shares repurchased     (100,000)   3,081       (3,081)    
Stock options exercised         16,889            
Share-based compensation expense         48,475            
Unrealized losses arising during the year, net of reclassification adjustment $ (223,383)           (223,383)        
Non-credit portion of OTTI losses 0           0        
Foreign currency translation adjustment (21,414)             (21,414)      
Net income 727,465               727,465    
Amounts attributable from noncontrolling interests 0               0    
Preferred share dividends                 (40,474)    
Common share dividends                 (118,993)    
Shares repurchased for treasury         0         (472,263)  
Total shareholders' equity at Dec. 31, 2013 5,867,962 $ 5,817,962 627,843 2,174 2,240,125 117,825 124,945 (7,120) 5,062,706 (2,232,711) $ 50,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares issued     0 17 158            
Cost of treasury shares reissued         (12,054)         12,054  
Issue costs on newly issued preferred shares         0            
Shares repurchased     0   0       0    
Stock options exercised         5,405            
Share-based compensation expense         51,382            
Unrealized losses arising during the year, net of reclassification adjustment (153,137)           (153,137)        
Non-credit portion of OTTI losses 0           0        
Foreign currency translation adjustment (10,262)             (10,262)      
Net income 804,564               804,564    
Amounts attributable from noncontrolling interests 6,181               6,181    
Preferred share dividends                 (40,088)    
Common share dividends                 (117,859)    
Shares repurchased for treasury         0         (543,202)  
Total shareholders' equity at Dec. 31, 2014 5,879,940 5,821,121 627,843 2,191 2,285,016 (45,574) (28,192) (17,382) 5,715,504 (2,763,859) 58,819
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares issued     0 11 3,416            
Cost of treasury shares reissued         (17,958)         17,958  
Issue costs on newly issued preferred shares         0            
Shares repurchased     0   0       0    
Stock options exercised         559            
Share-based compensation expense         30,355            
Unrealized losses arising during the year, net of reclassification adjustment (121,393)           (121,393)        
Non-credit portion of OTTI losses 0           0        
Foreign currency translation adjustment (21,498)             (21,498)      
Net income 641,631               641,631    
Amounts attributable from noncontrolling interests 0               0    
Preferred share dividends                 (40,069)    
Common share dividends                 (122,713)    
Shares repurchased for treasury         (60,000)         (264,538)  
Total shareholders' equity at Dec. 31, 2015 $ 5,866,882 $ 5,866,882 $ 627,843 $ 2,202 $ 2,241,388 $ (188,465) $ (149,585) $ (38,880) $ 6,194,353 $ (3,010,439) $ 0