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Investments Net Unrealized Gains/(Losses) on Available-for-sale Fixed Income and Equity Securities Reported as a Seperate Component of Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Components of Net Unrealized Gains or Losses Reported as Other Comprehensive Income [Line Items] |  |
Net Unrealized gains (losses) on available for sale fixed maturity securities and equity securities | $ 2,107,082 | $ 2,223,933
Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements | (1,123,806) | (1,201,974)
Deferred tax valuation allowance reversal | 22,534 | 22,534
Deferred income tax benefit | (344,147) | (357,686)
Net unrealized gains (losses) reported as accumulated other comprehensive income (loss) | $ 661,663 | $ 686,807

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