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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Preferred shares
Common stocks
Additional paid-in capital
Accumulated other comprehensive income (loss)
Unrealized gains (losses) on available for sale investments, net of tax
Cumulative foreign currency translation adjustments, net of tax
Retained earnings
Treasury shares, at cost
Balance at beginning of year 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 issued   0 11 3,416          
Treasury shares reissued       (17,958)         17,958
Shares repurchased       (60,000)         (264,538)
Costs associated with issuance of preferred shares       0          
Stock options exercised       559          
Share-based compensation expense       30,355          
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ (121,393)         (121,393)      
Foreign currency translation adjustment (21,498)           (21,498)    
Net income (loss) 641,631             641,631  
Preferred share dividends               (40,069)  
Loss on repurchase of preferred shares   0           0  
Common share dividends               (122,713)  
Balance at end of year 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)
Per share data                  
Cash dividends declared per common share (in usd per share) $ 1.22                
Shares issued   550,000 4 220          
Treasury shares reissued       (19,303)         20,691
Shares repurchased       60,000         (571,805)
Costs associated with issuance of preferred shares       (18,055)          
Stock options exercised       0          
Share-based compensation expense       35,607          
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ 67,262         67,262      
Foreign currency translation adjustment (638)           (638)    
Net income (loss) 513,368             513,368  
Preferred share dividends               (46,597)  
Loss on repurchase of preferred shares   (51,769)           (1,309)  
Common share dividends               (132,188)  
Balance at end of year at Dec. 31, 2016 $ 6,272,370 1,126,074 2,206 2,299,857 (121,841) (82,323) (39,518) 6,527,627 (3,561,553)
Per share data                  
Cash dividends declared per common share (in usd per share) $ 1.43                
Shares issued   0 0 0          
Treasury shares reissued       (39,368)         40,255
Shares repurchased       0         (285,858)
Costs associated with issuance of preferred shares       0          
Stock options exercised       0          
Share-based compensation expense       38,677          
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ 172,285         172,285      
Foreign currency translation adjustment 41,938           41,938    
Net income (loss) (368,969)             (368,969)  
Preferred share dividends               (46,810)  
Loss on repurchase of preferred shares   (351,074)           0  
Common share dividends               (132,182)  
Balance at end of year at Dec. 31, 2017 $ 5,341,264 $ 775,000 $ 2,206 $ 2,299,166 $ 92,382 $ 89,962 $ 2,420 $ 5,979,666 $ (3,807,156)
Per share data                  
Cash dividends declared per common share (in usd per share) $ 1.53