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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Trading Securities [Abstract]  
Amortized Cost, Due in less than one year $ 366,988
Amortized Cost, Due after one through five years 4,326,788
Amortized Cost, Due after five through ten years 985,535
Amortized Cost, Due after ten years 151,964
Amortized Cost 7,061,487
Fair Value, Due in less than one year 367,091
Fair Value, Due after one through five years 4,324,948
Fair Value, Due after five through ten years 1,001,975
Fair Value, Due after ten years 153,764
Fair Value 7,092,969
Mortgage-backed  
Trading Securities [Abstract]  
Amortized Cost 1,047,676
Fair Value 1,061,869
Asset-backed  
Trading Securities [Abstract]  
Amortized Cost 182,536
Fair Value $ 183,322