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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preference shares
Common shares
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Beginning balance at Dec. 31, 2020   $ 525,000 $ 50,811 $ 1,623,206 $ (12,642) $ 5,373,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 0 0    
Repurchase of shares   0 (1,076) (170,569)    
Issuance of restricted stock awards     235 (145)    
Offering expenses       0    
Change in redeemable noncontrolling interests       (1,865)    
Change in net unrealized gains (losses) on investments, net of tax $ (1,811)       (1,811)  
Foreign currency translation adjustments, net of tax 2,071       2,071  
Net income (loss) (330,495)          
Net (income) loss attributable to redeemable noncontrolling interests 46,850         46,850
Dividends on common shares (17,800)         (17,817)
Dividends on preference shares (7,289)         (7,289)
Ending balance at Mar. 31, 2021 7,078,337 525,000 49,970 1,450,627 (12,382) 5,065,122
Beginning balance at Dec. 31, 2021 6,624,281 750,000 44,445 608,121 (10,909) 5,232,624
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 0 0    
Repurchase of shares   0 (577) (92,857)    
Issuance of restricted stock awards     325 (770)    
Offering expenses       0    
Change in redeemable noncontrolling interests       (863)    
Change in net unrealized gains (losses) on investments, net of tax 834       834  
Foreign currency translation adjustments, net of tax (2,759)       (2,759)  
Net income (loss) (397,481)          
Net (income) loss attributable to redeemable noncontrolling interests 11,912         11,912
Dividends on common shares (16,200)         (16,241)
Dividends on preference shares (8,844)         (8,844)
Ending balance at Mar. 31, 2022 $ 6,116,960 $ 750,000 $ 44,193 $ 513,631 $ (12,834) $ 4,821,970