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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investment [Line Items]    
Fixed maturity investments trading, at fair value $ 4,841,609 $ 4,809,036
U.S. treasuries
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 1,706,929 1,352,413
Agencies
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 121,650 186,050
Non-U.S. government (Sovereign Debt)
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 271,495 334,580
Non-U.S. government-backed corporate
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 163,911 237,479
Corporate
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 1,580,038 1,803,415
Agency mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 321,629 336,661
Non-agency mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 252,530 243,795
Commercial mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 392,085 303,214
Asset-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value $ 31,342 $ 11,429