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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, 2013 | Mar. 31, 2013 Fair Value, Fixed Maturity Securities [Member] | Dec. 31, 2012 Fair Value, Fixed Maturity Securities [Member] | Mar. 31, 2013 Amortized Cost Basis [Member] | Dec. 31, 2012 Amortized Cost Basis [Member]
--- | --- | --- | --- | --- | ---
Investment Holdings [Line Items] |  |  |  |  |
Percentage of Investment Grade Fixed Maturity Securities, at Fair Value | 98.00% |  |  |  |
NAIC 1 Designation |  | $ 16,121,041 | $ 15,250,560 | $ 14,659,495 | $ 13,737,381
NAIC 2 Designation |  | 9,087,432 | 8,533,121 | 8,457,623 | 7,838,186
NAIC 3 Designation |  | 408,178 | 387,222 | 419,163 | 398,294
NAIC 4 Designation |  | 53,006 | 56,151 | 50,789 | 53,879
NAIC 5 Designation |  | 0 | 0 | 0 | 0
NAIC 6 Designation |  | 1,734 | 6,603 | 2,238 | 5,375
Fixed Maturity Securities |  | $ 25,671,391 | $ 24,233,657 | $ 23,589,308 | $ 22,033,115

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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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