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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 34,134,904 | $ 30,281,478
Fair value | 35,451,842 | 32,521,040
NAIC, Class 1 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 21,918,272 | 19,223,151
Fair value | 23,171,086 | 20,941,634
NAIC, Class 2 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 11,432,147 | 10,432,593
Fair value | 11,581,162 | 10,981,618
NAIC, Class 3 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 745,289 | 602,191
Fair value | 679,289 | 583,313
NAIC, Class 4 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 31,042 | 22,888
Fair value | 17,256 | 14,089
NAIC, Class 5 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 0
Fair value | 0 | 0
NAIC, Class 6 Designation [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 8,154 | 655
Fair value | $ 3,049 | $ 386

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