XML 45 R33.htm IDEA: XBRL DOCUMENT v3.7.0.1
Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale securities, due in one year or less, amortized cost $ 287,042  
Available for sale securities, due after one year through five years, amortized cost 3,482,397  
Available for sale securities, due after five years through ten years, amortized cost 11,828,053  
Available for sale securities, due after ten years through twenty years, amortized cost 8,981,750  
Available for sale securities, due after twenty years, amortized cost 8,601,339  
Available for sale securities, securities with a single maturity date, amortized cost 33,180,581  
Available for sale securities, amortized cost 41,907,744 $ 39,953,955
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, due in one year or less, fair value 294,085  
Available for sale securities, due after one year through five years, fair value 3,645,145  
Available for sale securities, due after five years through ten years, fair value 12,116,887  
Available for sale securities, due after ten years through twenty years, fair value 9,715,165  
Available for sale securities, due after twenty years, fair value 9,245,385  
Available for sale securities, securities with a single maturity date, fair value 35,016,667  
Available for sale securities, fair value 43,893,785 41,060,494
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 76,931  
Held for investment securities, securities with a single maturity date, amortized cost 76,931  
Held for investment, amortized cost 76,931 76,825
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 76,702  
Held for investment securities, securities with a single maturity date, fair value 76,702  
Held for investment 76,702 $ 68,766
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 1,090,846  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 1,181,850  
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 5,519,767  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 5,540,383  
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 2,116,550  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale securities, securities without a single maturity date, fair value 2,154,885  
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