Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of net income before income taxes (Details)

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Income Taxes - Components of net income before income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components Of Net Income Before Income Taxes [Line Items]      
Net income before income taxes $ 433,909 $ 340,334 $ 114,688
Bermuda      
Components Of Net Income Before Income Taxes [Line Items]      
Net income before income taxes
Foreign - Other      
Components Of Net Income Before Income Taxes [Line Items]      
Net income before income taxes $ 433,909 $ 340,334 $ 114,688