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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, due in one year or less, amortized cost $ 134,629  
Available for sale, due after one year through five years, amortized cost 2,355,740  
Available for sale, due after five years through ten years, amortized cost 10,586,688  
Available for sale, due after ten years through twenty years, amortized cost 8,683,404  
Available for sale, due after twenty years, amortized cost 7,327,475  
Available for sale, securities with a single maturity date, amortized cost 29,087,936  
Available for sale, amortized cost 35,823,710 $ 30,205,046
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, due in one year or less, fair value 138,161  
Available for sale, due after one year through five years, fair value 2,474,985  
Available for sale, due after five years through ten years, fair value 10,449,194  
Available for sale, due after ten years through twenty years, fair value 9,103,228  
Available for sale, due after twenty years, fair value 7,474,625  
Available for sale, securities with a single maturity date, fair value 29,640,193  
Available for sale, fair value 36,421,839 32,445,202
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment, due in one year or less, amortized cost 0  
Held for investment, due after one year through five years, amortized cost 0  
Held for investment, due after five years through ten years, amortized cost 0  
Held for investment, due after ten years through twenty years, amortized cost 0  
Held for investment, due after twenty years, amortized cost 76,622  
Held for investment, securities with a single maturity date, amortized cost 76,622  
Held for investment, amortized cost 76,622 76,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment, due in one year or less, fair value 0  
Held for investment, due after one year through five years, fair value 0  
Held for investment, due after five years through ten years, fair value 0  
Held for investment, due after ten years through twenty years, fair value 0  
Held for investment, due after twenty years, fair value 65,377  
Held for investment, securities with a single maturity date, fair value 65,377  
Held for investment, fair value 65,377 $ 75,838
Residential Mortgage Backed Securities [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 1,366,985  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 1,462,072  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment, securities without a single maturity date, fair value 0  
Commercial Mortgage Backed Securities [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 4,238,265  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 4,174,396  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment, securities without a single maturity date, fair value 0  
Other Asset Backed Securities [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 1,130,524  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 1,145,178  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment, securities without a single maturity date, fair value $ 0