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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           $ 2,142   $ (2,142)  
Cumulative effect of adoption of ASU | Accounting Standards Update 2016-01           (69,604)   69,604  
Balance at beginning of period at Dec. 31, 2017   $ 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                 (7,163)
Shares reissued       (19,272)         20,933
Share-based compensation expense       9,603          
Unrealized gains (losses) arising during the period, net of reclassification adjustment $ (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)  
Balance at beginning and end of period 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)
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  
Balance at beginning of period at Dec. 31, 2018 5,030,071 775,000 2,206 2,308,583 (177,110) (168,365) (8,745) 5,912,812 (3,791,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased                 (9,003)
Shares reissued       (19,302)         21,035
Share-based compensation expense       7,358          
Unrealized gains (losses) arising during the period, net of reclassification adjustment 203,543         203,543      
Foreign currency translation adjustment 2,662           2,663    
Net income 108,781             108,781  
Preferred share dividends               (10,656)  
Common share dividends               (34,334)  
Balance at beginning and end of period at Mar. 31, 2019 $ 5,300,156 $ 775,000 $ 2,206 $ 2,296,639 $ 29,096 $ 35,178 $ (6,082) $ 5,976,603 $ (3,779,388)