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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized cost	$ 40,030,780	$ 35,900,332
Fair value	41,129,260	36,487,216
NAIC, Class 1 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	25,607,268	23,363,259
Fair value	26,507,798	24,207,801
NAIC, Class 2 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	13,037,592	11,709,730
Fair value	13,295,648	11,589,325
NAIC, Class 3 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	1,201,059	758,531
Fair value	1,155,702	643,293
NAIC, Class 4 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	154,226	60,480
Fair value	137,188	44,312
NAIC, Class 5 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	17,475	0
Fair value	24,664	0
NAIC, Class 6 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	13,160	8,332
Fair value	$ 8,260	$ 2,485

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Amortized cost of fixed maturity portfolio, available for sale and held for investment, combined totals.

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