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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - 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
Unrealized gains (losses) on available-for-sale investments, net of tax
Cumulative effect of adoption
Cumulative foreign currency translation adjustments, net of tax
Retained earnings
Retained earnings
Cumulative effect of adoption
Treasury shares, at cost
Balance at beginning of year at Dec. 31, 2017   $ 775,000 $ 2,206 $ 2,299,166 $ 92,382 $ 89,962   $ 2,420 $ 5,979,666   $ (3,807,156)
Balance at beginning of year (Accounting Standards Update 2018-02) at Dec. 31, 2017             $ 2,106     $ (2,106)  
Balance at beginning of year (Accounting Standards Update 2016-01) at Dec. 31, 2017             $ (69,604)     $ 69,604  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares repurchased   0                  
Treasury shares reissued       (24,088)             25,816
Share-based compensation expense       33,505              
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ (190,829)         (190,829)          
Foreign currency translation adjustment (11,165)             (11,165)      
Net income (loss) 43,021               43,021    
Preferred share dividends [1]                 (42,625)    
Common share dividends [1]                 (134,748)    
Shares repurchased                     (10,080)
Balance at end of year 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   0                  
Treasury shares reissued       (21,046)             22,779
Share-based compensation expense       29,675              
Unrealized gains (losses) arising during the year, net of reclassification adjustment 349,886         349,886          
Foreign currency translation adjustment (1,066)             (1,066)      
Net income (loss) 323,473               323,473    
Preferred share dividends [1]                 (41,112)    
Common share dividends [1]                 (138,487)    
Shares repurchased                     (10,165)
Balance at end of year 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)                  
Treasury shares reissued       (22,732)             24,620
Share-based compensation expense       35,574              
Unrealized gains (losses) arising during the year, net of reclassification adjustment 239,114         239,114          
Foreign currency translation adjustment 3,571             3,571      
Net income (loss) (120,424)               (120,424)    
Preferred share dividends [1]                 (30,250)    
Common share dividends [1]                 (142,405)    
Shares repurchased                     (10,382)
Balance at end of year at Dec. 31, 2020 $ 5,295,694 $ 550,000 $ 2,206 $ 2,330,054 $ 414,395 $ 420,635   $ (6,240) $ 5,763,607   $ (3,764,568)
[1] Refer to Note 14 'Shareholder's Equity' for details on dividends declared and paid related to the Company's common and preferred shares.