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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) income
Retained earnings
Beginning balance - January 1 at Dec. 31, 2016   $ 400,000 $ 41,187 $ 216,558 $ 1,133 $ 4,207,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0        
Repurchase of shares     (1,322) (187,269)    
Offering expenses       0    
Exercise of options and issuance of restricted stock awards     164 3,870    
Change in redeemable noncontrolling interests       (307)    
Change in net unrealized gains on investments         (972)  
Cumulative effect of adoption of ASU 2016-09 (Note 2)           2,213
Net income (loss) $ (224,532)         (356,870)
Net (income) loss attributable to redeemable noncontrolling interests 132,338         132,338
Dividends on common shares           (38,624)
Dividends on preference shares (16,786)         (16,786)
Ending balance - September 30 at Sep. 30, 2017 4,403,012 400,000 40,029 32,852 161 3,929,970
Beginning balance - January 1 at Dec. 31, 2017 4,391,375 400,000 40,024 37,355 224 3,913,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   250,000        
Repurchase of shares     0 0    
Offering expenses       (7,883)    
Exercise of options and issuance of restricted stock awards     242 12,583    
Change in redeemable noncontrolling interests       340    
Change in net unrealized gains on investments         (1,707)  
Cumulative effect of adoption of ASU 2016-09 (Note 2)           0
Net income (loss) 302,081         392,903
Net (income) loss attributable to redeemable noncontrolling interests (90,822)         (90,822)
Dividends on common shares           (39,611)
Dividends on preference shares (20,899)         (20,899)
Ending balance - September 30 at Sep. 30, 2018 $ 4,886,521 $ 650,000 $ 40,266 $ 42,395 $ (1,483) $ 4,155,343