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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale securities, due in one year or less, amortized cost $ 166,640  
Available for sale securities, due after one year through five years, amortized cost 2,643,302  
Available for sale securities, due after five years through ten years, amortized cost 10,835,215  
Available for sale securities, due after ten years through twenty years, amortized cost 8,715,797  
Available for sale securities, due after twenty years, amortized cost 7,401,917  
Available for sale securities, securities with a single maturity date, amortized cost 29,762,871  
Available for sale securities, amortized cost 36,696,786 $ 35,823,710
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, due in one year or less, fair value 170,202  
Available for sale securities, due after one year through five years, fair value 2,774,423  
Available for sale securities, due after five years through ten years, fair value 11,043,464  
Available for sale securities, due after ten years through twenty years, fair value 9,407,493  
Available for sale securities, due after twenty years, fair value 7,918,173  
Available for sale securities, securities with a single maturity date, fair value 31,313,755  
Available for sale securities, fair value 38,410,000 36,421,839
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment securities, due in one year or less, amortized cost 0  
Held for investment securities, due after one year through five years, amortized cost 0  
Held for investment securities, due after five years through ten years, amortized cost 0  
Held for investment securities, due after ten years through twenty years, amortized cost 0  
Held for investment securities, due after twenty years, amortized cost 76,672  
Held for investment securities, securities with a single maturity date, amortized cost 76,672  
Held for investment, amortized cost 76,672 76,622
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment securities, due in one year or less, fair value 0  
Held for investment securities, due after one year through five years, fair value 0  
Held for investment securities, due after five years through ten years, fair value 0  
Held for investment securities, due after ten years through twenty years, fair value 0  
Held for investment securities, due after twenty years, fair value 67,672  
Held for investment securities, securities with a single maturity date, fair value 67,672  
Held for investment 67,672 $ 65,377
Residential Mortgage Backed Securities [Member]    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale securities, securities without a single maturity date, amortized cost 1,313,775  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 1,432,353  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment securities, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment securities, 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, securities without a single maturity date, amortized cost 4,472,852  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 4,503,261  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment securities, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment securities, 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, securities without a single maturity date, amortized cost 1,147,288  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 1,160,631  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Held for investment securities, securities without a single maturity date, amortized cost 0  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Held for investment securities, securities without a single maturity date, fair value $ 0