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Statutory Requirements (Statutory Net Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Bermuda      
Statutory Accounting Practices [Line Items]      
Statutory net income $ 355,132 $ 623,931 $ 712,820
U.S.      
Statutory Accounting Practices [Line Items]      
Statutory net income 58,752 0 0
United Kingdom      
Statutory Accounting Practices [Line Items]      
Statutory net income $ 1,627 $ 24,433 $ 7,745