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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 27,331,923 | $ 26,603,985
Fair value | 28,380,393 | 26,671,287
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 16,990,834 | 16,394,654
Fair value | 17,755,174 | 16,531,250
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 9,755,720 | 9,630,251
Fair value | 10,059,679 | 9,598,399
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 519,452 | 502,822
Fair value | 505,434 | 474,165
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 64,256 | 74,493
Fair value | 58,988 | 66,078
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 | 1,661 | 1,765
Fair value | $ 1,118 | $ 1,395

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