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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost, Due in less than one year $ 267,608  
Trading Debt Securities, Amortized Cost, Due after one through five years 3,882,884  
Trading Debt Securities, Amortized Cost, Due after five through ten years 1,045,139  
Trading Debt Securities, Amortized Cost, Due after ten years 329,869  
Trading Debt Securities, Amortized Cost 6,915,503  
Trading Debt Securities, Fair Value, Due in less than one year 265,366  
Trading Debt Securities, Fair Value, Due after one through five years 3,876,482  
Trading Debt Securities, Fair Value, Due after five through ten years 1,028,728  
Trading Debt Securities, Fair Value, Due after ten years 328,865  
Trading Debt Securities, Fair Value 6,905,302  
Available-for-sale Securities [Abstract]    
Available for Sale, Amortized Cost, Due in less than one year 0  
Available for Sale, Amortized Cost, Due after one through five years 0  
Available for Sale, Amortized Cost, Due after five through ten years 0  
Available for Sale, Amortized Cost, Due after ten years 0  
Available for Sale, Amortized Cost 17,778 $ 23,772
Available for Sale, Fair Value, Due in less than one year 0  
Available for Sale, Fair Value, Due after one through five years 0  
Available for Sale, Fair Value, Due after five through ten years 0  
Available for Sale, Fair Value, Due after ten years 0  
Available for Sale, Fair Value 19,905 $ 26,885
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost, Due in less than one year 267,608  
Debt Securities, Amortized Cost, Due after one through five years 3,882,884  
Debt Securities, Amortized Cost, Due after five through ten years 1,045,139  
Debt Securities, Amortized Cost, Due after ten years 329,869  
Debt Securities, Amortized Cost 6,933,281  
Debt Securities, Fair Value, Due in less than one year 265,366  
Debt Securities, Fair Value, Due after one through five years 3,876,482  
Debt Securities, Fair Value, Due after five through ten years 1,028,728  
Debt Securities, Fair Value, Due after ten years 328,865  
Debt Securities, Fair Value 6,925,207  
Mortgage-backed    
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost 1,285,202  
Trading Debt Securities, Fair Value 1,300,830  
Available-for-sale Securities [Abstract]    
Available for Sale, Amortized Cost 15,205  
Available for Sale, Fair Value 17,268  
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost 1,300,407  
Debt Securities, Fair Value 1,318,098  
Asset-backed    
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost 104,801  
Trading Debt Securities, Fair Value 105,031  
Available-for-sale Securities [Abstract]    
Available for Sale, Amortized Cost 2,573  
Available for Sale, Fair Value 2,637  
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost 107,374  
Debt Securities, Fair Value $ 107,668