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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 37,059,450 | $ 35,900,332
Fair value | 39,932,345 | 36,487,216
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 23,685,524 | 23,363,259
Fair value | 25,965,937 | 24,207,801
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 12,154,249 | 11,709,730
Fair value | 12,860,194 | 11,589,325
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,045,123 | 758,531
Fair value | 972,142 | 643,293
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 141,552 | 60,480
Fair value | 107,753 | 44,312
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 19,384 | 0
Fair value | 12,180 | 0
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 13,618 | 8,332
Fair value | $ 14,139 | $ 2,485

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