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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]
Total shareholders’ equity at Dec. 31, 2014     $ 627,843 $ 2,191 $ 2,285,016 $ (45,574) $ (28,192) $ (17,382) $ 5,715,504 $ (2,763,859)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Shares repurchased     0              
Shares issued       9 2,294          
Cost of treasury shares reissued         (13,517)         13,517
Stock options exercised         560          
Share-based compensation expense         12,712          
Unrealized gains arising during the period, net of reclassification adjustment $ 39,917           39,917      
Non-credit portion of OTTI losses 0           0      
Foreign currency translation adjustment (11,413)             (11,413)    
Net income 165,825               165,825  
Preferred share dividends                 (10,022)  
Common share dividends                 (29,068)  
Shares repurchased for treasury         0         (14,772)
Total shareholders’ equity at Mar. 31, 2015   $ 5,977,163 627,843 2,200 2,287,065 (17,070) 11,725 (28,795) 5,842,239 (2,765,114)
Total shareholders’ equity at Dec. 31, 2015 5,866,882   627,843 2,202 2,241,388 (188,465) (149,585) (38,880) 6,194,353 (3,010,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Shares repurchased     (2,843)              
Shares issued       4 1,779          
Cost of treasury shares reissued         (15,007)         16,392
Stock options exercised         0          
Share-based compensation expense         8,373          
Unrealized gains arising during the period, net of reclassification adjustment 197,915           197,915      
Non-credit portion of OTTI losses 0           0      
Foreign currency translation adjustment 8,196             8,196    
Net income 48,386               48,386  
Preferred share dividends                 (9,969)  
Common share dividends                 (33,838)  
Shares repurchased for treasury         60,000         (196,011)
Total shareholders’ equity at Mar. 31, 2016 $ 5,950,259 $ 5,950,259 $ 625,000 $ 2,206 $ 2,296,533 $ 17,646 $ 48,330 $ (30,684) $ 6,198,932 $ (3,190,058)