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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
Dec. 31, 2012
Dec. 31, 2011
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 $ 2,223,933 $ 1,488,237
Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements (1,201,974) (819,476)
Deferred tax valuation allowance reversal 22,534 22,534
Deferred income tax benefit (357,686) (234,066)
Net unrealized gains (losses) reported as accumulated other comprehensive income (loss) $ 686,807 $ 457,229