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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 loss
Retained earnings
Beginning balance at Dec. 31, 2019   $ 650,000 $ 44,148 $ 568,277 $ (1,939) $ 4,710,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   (125,000) (406) (62,215)    
Issuance of restricted stock awards     292 (3,105)    
Change in redeemable noncontrolling interests       (349)    
Change in net unrealized losses on investments, net of tax $ (657)       (657)  
Foreign currency translation adjustments, net of tax 932       932  
Net (loss) income 25,173          
Net loss (income) attributable to redeemable noncontrolling interests (98,091)         (98,091)
Dividends on common shares (15,400)         (15,359)
Dividends on preference shares (9,056)         (9,056)
Ending balance at Mar. 31, 2020 5,683,526 525,000 44,034 502,608 (1,664) 4,613,548
Beginning balance at Dec. 31, 2020 7,560,248 525,000 50,811 1,623,206 (12,642) 5,373,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares   0 (1,076) (170,569)    
Issuance of restricted stock awards     235 (145)    
Change in redeemable noncontrolling interests       (1,865)    
Change in net unrealized losses on investments, net of tax (1,811)       (1,811)  
Foreign currency translation adjustments, net of tax 2,071       2,071  
Net (loss) income (330,495)          
Net loss (income) 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