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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 of period at Dec. 31, 2015   $ 400,000 $ 43,701 $ 507,674 $ 2,108 $ 3,778,701
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (2,420) (269,847)    
Exercise of options and issuance of restricted stock awards     215 5,465    
Change in redeemable noncontrolling interests       (731)    
Change in net unrealized gains on investments         229  
Net income $ 350,737         350,737
Net income attributable to redeemable noncontrolling interests (75,226)         (75,226)
Dividends on common shares           (26,198)
Dividends on preference shares (11,191)         (11,191)
End of period at Jun. 30, 2016 4,703,217 400,000 41,496 242,561 2,337 4,016,823
Beginning of period at Dec. 31, 2016 4,866,577 400,000 41,187 216,558 1,133 4,207,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase of shares     (1,052) (148,608)    
Exercise of options and issuance of restricted stock awards     147 (61)    
Change in redeemable noncontrolling interests       (306)    
Change in net unrealized gains on investments         (1,272)  
Net income 346,624         346,624
Net income attributable to redeemable noncontrolling interests (71,939)         (71,939)
Dividends on common shares           (25,877)
Dividends on preference shares (11,191)         (11,191)
End of period at Jun. 30, 2017 $ 4,955,255 $ 400,000 $ 40,282 $ 67,583 $ (139) $ 4,447,529