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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Trading Securities [Abstract]    
Fixed maturity investments trading, Due in less than one year, Amortized cost $ 485,939  
Fixed maturity investments trading, Due after one through five years, Amortized cost 3,927,373  
Fixed maturity investments trading, Due after five through ten years, Amortized cost 1,024,285  
Fixed maturity investments trading, Due after ten years, Amortized cost 161,405  
Fixed maturity investments trading, Amortized cost 6,920,690 $ 6,825,877
Fixed maturity investments trading, Due in less than one year, Fair value 483,642  
Fixed maturity investments trading, Due after one through five years, Fair value 3,900,915  
Fixed maturity investments trading, Due after five through ten years, Fair value 1,028,249  
Fixed maturity investments trading, Due after ten years, Fair value 158,896  
Fixed maturity investments trading, Fair value 6,891,244  
Mortgage-backed    
Trading Securities [Abstract]    
Fixed maturity investments trading, Amortized cost 1,133,746  
Fixed maturity investments trading, Fair value 1,131,184  
Asset-backed    
Trading Securities [Abstract]    
Fixed maturity investments trading, Amortized cost 187,942  
Fixed maturity investments trading, Fair value $ 188,358