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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Preferred shares
Common shares (par value)
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02           $ 0   $ 0  
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01           0   0  
Total shareholders’ equity at Dec. 31, 2016   $ 1,126,074 $ 2,206 $ 2,299,857 $ (121,841) (82,323) $ (39,518) 6,527,627 $ (3,561,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (37,363)         38,248
Shares repurchased                 (151,242)
Share-based compensation expense       14,177          
Unrealized gains (losses) arising during the period $ 92,671         92,671      
Foreign currency translation adjustment 29,869           29,869    
Net income 19,855             19,855  
Preferred share dividends               (14,841)  
Common share dividends               (33,379)  
Total shareholders’ equity at Mar. 31, 2017 6,230,365 1,126,074 2,206 2,276,671 699 10,348 (9,649) 6,499,262 (3,674,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02           2,142   (2,142)  
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01           (69,604)   69,604  
Total shareholders’ equity 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (19,272)         20,933
Shares repurchased                 (7,163)
Share-based compensation expense       9,603          
Unrealized gains (losses) arising during the period (111,406)         (111,406)      
Foreign currency translation adjustment 1,270           1,270    
Net income 73,202             73,202  
Preferred share dividends               (10,656)  
Common share dividends               (33,380)  
Total shareholders’ equity at Mar. 31, 2018 $ 5,264,395 $ 775,000 $ 2,206 $ 2,289,497 $ (85,216) $ (88,906) $ 3,690 $ 6,076,294 $ (3,793,386)