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Statutory Requirements (Statutory Capital and Surplus) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Bermuda    
Statutory Accounting Practices [Line Items]    
Actual statutory capital and surplus $ 4,879,154 $ 3,375,317
Required statutory capital and surplus 686,854 479,346
Restricted net assets 838,633 1,018,878
U.S.    
Statutory Accounting Practices [Line Items]    
Actual statutory capital and surplus 521,522 0
Required statutory capital and surplus 219,164 0
Restricted net assets 321,362 0
United Kingdom    
Statutory Accounting Practices [Line Items]    
Actual statutory capital and surplus 485,256 409,046
Required statutory capital and surplus 485,256 409,046
Restricted net assets $ 0 $ 0