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Investments Changes in Net Unrealized Gains/Losses on Investments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investment Holdings [Line Items]        
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes $ 405,237 $ 1,093,611 $ 797,248 $ 1,246,934
Changes Net Unrealized Gains/Losses for Adjustments in Deferred Policy Acquisition Costs, Deferred Sales Inducements, Deferred Tax Valuation Allowances, and Deferred Income Taxes (272,923) (762,383) (542,291) (874,044)
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax 132,314 331,228 254,957 372,890
Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs and Deferred Sales Inducements (201,676) (584,029) (405,006) (673,257)
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss) (71,247) (178,354) (137,285) (200,787)
Equity Securities [Member]
        
Investment Holdings [Line Items]        
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes 2,963 (1,212) 6,600 1,428
Fixed Maturities [Member]
        
Investment Holdings [Line Items]        
Change in Net Unrealized Gain/Loss, Fixed Maturity Securities, Held for Investment (626) 22,325 (12,505) 51,727
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes $ 402,274 $ 1,094,823 $ 790,648 $ 1,245,506