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Investments (Schedule of Credit Quality of Fixed Maturity Portfolio by NAIC Designation) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investment Holdings [Line Items] |  |
Amortized cost | $ 25,859,328 | $ 22,033,115
Fair value | 26,323,721 | 24,233,657
NAIC, Class 1 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 15,945,089 | 13,737,381
Fair value | 16,367,238 | 15,250,560
NAIC, Class 2 Designation [Member] | Investments, External Credit Rating, Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 9,277,558 | 7,838,186
Fair value | 9,352,577 | 8,533,121
NAIC, Class 3 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 533,890 | 398,294
Fair value | 509,433 | 387,222
NAIC, Class 4 Designation [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |
Investment Holdings [Line Items] |  |
Amortized cost | 100,907 | 53,879
Fair value | 93,126 | 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 | 1,884 | 5,375
Fair value | $ 1,347 | $ 6,603

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