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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized cost	$ 39,275,850	$ 35,900,332
Fair value	42,379,957	36,487,216
NAIC, Class 1 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	25,136,784	23,363,259
Fair value	27,489,043	24,207,801
NAIC, Class 2 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	12,859,996	11,709,730
Fair value	13,679,587	11,589,325
NAIC, Class 3 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	1,107,948	758,531
Fair value	1,062,620	643,293
NAIC, Class 4 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	147,237	60,480
Fair value	124,317	44,312
NAIC, Class 5 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	12,794	0
Fair value	18,839	0
NAIC, Class 6 Designation [Member]
Investment Holdings [Line Items]
Amortized cost	11,091	8,332
Fair value	$ 5,551	$ 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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