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Investments Schedule of Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Investment Holdings [Line Items] |  |
Percentage of Investment Grade Fixed Maturity Securities, at Fair Value | 98.00% |
Fair Value, Fixed Maturity Securities [Member] |  |
Investment Holdings [Line Items] |  |
NAIC 1 Designation | $ 15,250,560 | $ 15,486,571
NAIC 2 Designation | 8,533,121 | 5,272,759
NAIC 3 Designation | 387,222 | 315,406
NAIC 4 Designation | 56,151 | 23,989
NAIC 5 Designation | 0 | 5,756
NAIC 6 Designation | 6,603 | 4,050
Fixed Maturity Securities | 24,233,657 | 21,108,531
Amortized Cost Basis [Member] |  |
Investment Holdings [Line Items] |  |
NAIC 1 Designation | 13,737,381 | 14,359,272
NAIC 2 Designation | 7,838,186 | 4,894,739
NAIC 3 Designation | 398,294 | 335,642
NAIC 4 Designation | 53,879 | 26,674
NAIC 5 Designation | 0 | 4,932
NAIC 6 Designation | 5,375 | 3,226
Fixed Maturity Securities | $ 22,033,115 | $ 19,624,485

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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 1. + References No definition available. + Details
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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 2. + References No definition available. + Details
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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 3. + References No definition available. + Details
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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 4. + References No definition available. + Details
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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 5. + References No definition available. + Details
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- Definition The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 6. + References No definition available. + Details
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- Definition Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value. + References No definition available. + Details
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