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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
Balance at beginning of period at Dec. 31, 2018   $ 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   0              
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 (loss) 108,781             108,781  
Preferred share dividends               (10,656)  
Common share dividends               (34,334)  
Shares repurchased (9,003)               (9,003)
Shares reissued       (19,302)         21,035
Share-based compensation expense       7,358          
Balance at 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)
Balance at beginning of period at Dec. 31, 2019 5,544,008 775,000 2,206 2,317,212 171,710 181,521 (9,811) 6,056,686 (3,778,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased   (225,000)              
Unrealized gains (losses) arising during the period, net of reclassification adjustment (253,904)         (253,904)      
Foreign currency translation adjustment (7,725)           (7,725)    
Net income (loss) (177,827)             (177,827)  
Preferred share dividends               (7,563)  
Common share dividends               (35,289)  
Shares repurchased (8,492)               (8,492)
Shares reissued       (18,695)         20,584
Share-based compensation expense       9,481          
Balance at end of period at Mar. 31, 2020 $ 4,839,578 $ 550,000 $ 2,206 $ 2,307,998 $ (89,919) $ (72,383) $ (17,536) $ 5,836,007 $ (3,766,714)