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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost, Due in less than one year $ 220,880  
Trading Debt Securities, Amortized Cost, Due after one through five years 3,862,284  
Trading Debt Securities, Amortized Cost, Due after five through ten years 983,765  
Trading Debt Securities, Amortized Cost, Due after ten years 337,497  
Trading Debt Securities, Amortized Cost 6,603,492  
Trading Debt Securities, Fair Value, Due in less than one year 219,382  
Trading Debt Securities, Fair Value, Due after one through five years 3,859,616  
Trading Debt Securities, Fair Value, Due after five through ten years 970,723  
Trading Debt Securities, Fair Value, Due after ten years 331,059  
Trading Debt Securities, Fair Value 6,591,434  
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 19,384 $ 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 21,754 $ 26,885
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost, Due in less than one year 220,880  
Debt Securities, Amortized Cost, Due after one through five years 3,862,284  
Debt Securities, Amortized Cost, Due after five through ten years 983,765  
Debt Securities, Amortized Cost, Due after ten years 337,497  
Debt Securities, Amortized Cost 6,622,876  
Debt Securities, Fair Value, Due in less than one year 219,382  
Debt Securities, Fair Value, Due after one through give years 3,859,616  
Debt Securities, Fair Value, Due after five through ten years 970,723  
Debt Securities, Fair Value, Due after ten years 331,059  
Debt Securities, Fair Value 6,613,188  
Mortgage-backed    
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost 1,135,710  
Trading Debt Securities, Fair Value 1,147,228  
Available-for-sale Securities [Abstract]    
Available for Sale, Amortized Cost 16,583  
Available for Sale, Fair Value 18,866  
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost 1,152,293  
Debt Securities, Fair Value 1,166,094  
Asset-backed    
Trading Securities [Abstract]    
Trading Debt Securities, Amortized Cost 63,356  
Trading Debt Securities, Fair Value 63,426  
Available-for-sale Securities [Abstract]    
Available for Sale, Amortized Cost 2,801  
Available for Sale, Fair Value 2,888  
Fixed Maturity Investments [Abstract]    
Debt Securities, Amortized Cost 66,157  
Debt Securities, Fair Value $ 66,314