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Investments (Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 26,603,985 | $ 22,033,115
Fair value | 26,671,287 | 24,233,657
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 16,394,654 | 13,737,381
Fair value | 16,531,250 | 15,250,560
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 9,630,251 | 7,838,186
Fair value | 9,598,399 | 8,533,121
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 502,822 | 398,294
Fair value | 474,165 | 387,222
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 74,493 | 53,879
Fair value | 66,078 | 56,151
NAIC, Class 5 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 0 | 0
Fair value | 0 | 0
NAIC, Class 6 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 1,765 | 5,375
Fair value | $ 1,395 | $ 6,603

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