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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investment [Line Items]    
Fixed maturity investments trading, at fair value $ 4,750,766 $ 4,809,036
U.S. treasuries
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 1,636,326 1,352,413
Agencies
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 120,025 186,050
Non-U.S. government (Sovereign Debt)
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 282,326 334,580
Non-U.S. government-backed corporate
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 141,159 237,479
Corporate
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 1,572,168 1,803,415
Agency mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 320,584 336,661
Non-agency mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 252,241 243,795
Commercial mortgage-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value 397,685 303,214
Asset-backed
    
Investment [Line Items]    
Fixed maturity investments trading, at fair value $ 28,252 $ 11,429