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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]                  
Shares repurchased   (351,074)              
Treasury shares reissued       (38,840)         39,725
Share-based compensation expense       22,506          
Net unrealized gains (losses) on equities $ 0                
Unrealized gains (losses) arising during the period 167,411         167,411      
Foreign currency translation adjustment 38,736           38,736    
Net income 115,542             115,542  
Preferred share dividends               (25,497)  
Common share dividends               (65,871)  
Shares repurchased                 (282,313)
Total shareholders’ equity at Jun. 30, 2017 5,892,695 775,000 2,206 2,283,523 84,306 85,088 (782) 6,551,801 (3,804,141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of adoption of ASU | Accounting Standards Update 2018-02           2,106   (2,106)  
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01               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]                  
Shares repurchased   0              
Treasury shares reissued       (21,879)         23,541
Share-based compensation expense       18,346          
Net unrealized gains (losses) on equities (31,832)                
Net unrealized gains (losses) on equities | Accounting Standards Update 2016-01 (69,604)                
Deferred income tax expense (benefit) | Accounting Standards Update 2016-01 13,000                
Unrealized gains (losses) arising during the period (180,194)         (180,194)      
Foreign currency translation adjustment (7,858)           (7,858)    
Net income 176,719             176,719  
Preferred share dividends               (21,313)  
Common share dividends               (66,945)  
Shares repurchased                 (8,676)
Total shareholders’ equity at Jun. 30, 2018 $ 5,253,005 $ 775,000 $ 2,206 $ 2,295,633 $ (163,168) $ (157,730) $ (5,438) $ 6,135,625 $ (3,792,291)