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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Preferred shares
Common shares
Additional paid-in capital
Accumulated other comprehensive income
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, 2019   $ 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       (19,348)         21,236
Share-based compensation expense       27,332          
Unrealized gains (losses) arising during the period, net of reclassification adjustment $ 179,982         179,982      
Foreign currency translation adjustment (1,581)           (1,581)    
Net income (loss) (123,167)             (123,167)  
Preferred share dividends [1]               (22,688)  
Common share dividends [1]               (106,194)  
Shares repurchased                 (8,685)
Balance at end of period at Sep. 30, 2020 5,265,895 550,000 2,206 2,325,196 350,111 361,503 (11,392) 5,804,637 (3,766,255)
Balance at beginning of period at Jun. 30, 2020   550,000 2,206 2,317,354 281,599 295,301 (13,702) 5,913,029 (3,766,368)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased   0              
Treasury shares reissued       (197)         197
Share-based compensation expense       8,039          
Unrealized gains (losses) arising during the period, net of reclassification adjustment 66,202         66,202      
Foreign currency translation adjustment 2,310           2,310    
Net income (loss) (65,382)             (65,382)  
Preferred share dividends [1]               (7,563)  
Common share dividends [1]               (35,447)  
Shares repurchased                 (84)
Balance at end of period at Sep. 30, 2020 5,265,895 550,000 2,206 2,325,196 350,111 361,503 (11,392) 5,804,637 (3,766,255)
Balance at beginning of period 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased   0              
Treasury shares reissued       (24,437)         25,582
Share-based compensation expense       31,278          
Unrealized gains (losses) arising during the period, net of reclassification adjustment (265,197)         (265,197)      
Foreign currency translation adjustment 924           924    
Net income (loss) 413,716             413,716  
Preferred share dividends [1]               (22,688)  
Common share dividends [1]               (109,792)  
Shares repurchased                 (10,025)
Balance at end of period at Sep. 30, 2021 5,335,055 550,000 2,206 2,336,895 150,122 155,438 (5,316) 6,044,843 (3,749,011)
Balance at beginning of period at Jun. 30, 2021   550,000 2,206 2,326,288 226,317 227,826 (1,509) 6,034,151 (3,749,202)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased   0              
Treasury shares reissued       (397)         397
Share-based compensation expense       11,004          
Unrealized gains (losses) arising during the period, net of reclassification adjustment (72,388)         (72,388)      
Foreign currency translation adjustment (3,807)           (3,807)    
Net income (loss) 54,948             54,948  
Preferred share dividends [1]               (7,563)  
Common share dividends [1]               (36,693)  
Shares repurchased                 (206)
Balance at end of period at Sep. 30, 2021 $ 5,335,055 $ 550,000 $ 2,206 $ 2,336,895 $ 150,122 $ 155,438 $ (5,316) $ 6,044,843 $ (3,749,011)
[1] Refer to Note 9 'Shareholder's Equity' for details on dividends declared and paid related to the Company's common and preferred shares.