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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, 2020   $ 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]                  
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]                  
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)
Balance at beginning of period at Dec. 31, 2021 5,410,656 550,000 2,206 2,346,179 56,536 62,155 (5,619) 6,204,745 (3,749,010)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (30,844)         32,389
Share-based compensation expense       39,560          
Unrealized gains (losses) arising during the period, net of reclassification adjustment (1,083,017)         (1,083,017)      
Foreign currency translation adjustment (16,169)           (16,169)    
Net income (loss) 174,592             174,592  
Preferred share dividends [1]               (22,688)  
Common share dividends [1]               (112,381)  
Shares repurchased                 (48,675)
Balance at end of period at Sep. 30, 2022 4,343,423 550,000 2,206 2,354,895 (1,042,650) (1,020,862) (21,788) 6,244,268 (3,765,296)
Balance at beginning of period at Jun. 30, 2022   550,000 2,206 2,341,507 (724,114) (715,077) (9,037) 6,298,680 (3,765,648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Treasury shares reissued       (694)         694
Share-based compensation expense       14,082          
Unrealized gains (losses) arising during the period, net of reclassification adjustment (305,785)         (305,785)      
Foreign currency translation adjustment (12,751)           (12,751)    
Net income (loss) (9,384)             (9,384)  
Preferred share dividends [1]               (7,563)  
Common share dividends [1]               (37,465)  
Shares repurchased                 (342)
Balance at end of period at Sep. 30, 2022 $ 4,343,423 $ 550,000 $ 2,206 $ 2,354,895 $ (1,042,650) $ (1,020,862) $ (21,788) $ 6,244,268 $ (3,765,296)
[1] Refer to Note 9 'Shareholders' Equity' for details on dividends declared and paid related to the Company's common and preferred shares.