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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
Trading Securities [Abstract]  
Amortized Cost, Due in less than one year $ 428,307
Amortized Cost, Due after one through five years 4,112,662
Amortized Cost, Due after five through ten years 1,137,632
Amortized Cost, Due after ten years 168,920
Amortized Cost 7,257,020
Fair Value, Due in less than one year 427,683
Fair Value, Due after one through five years 4,111,191
Fair Value, Due after five through ten years 1,153,811
Fair Value, Due after ten years 170,578
Fair Value 7,282,264
Mortgage-backed  
Trading Securities [Abstract]  
Amortized Cost 1,218,486
Fair Value 1,227,438
Asset-backed  
Trading Securities [Abstract]  
Amortized Cost 191,013
Fair Value $ 191,563