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Deferred Policy Acquisition Costs and Deferred Sales Inducements Deferred Sales Inducements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Movement in Deferred Sales Inducements [Roll Forward]      
Deferred Sales Inducements, Net $ 1,242,787 $ 1,227,328 $ 1,011,449
Deferral of sales inducements 306,659 385,123 370,714
Amortization of deferred sales inducements (87,157) (71,781) (59,873)
Deferred Sales Inducments, Amortization Expense, Unrealized Investmetn Gains (Loses) (169,948) (297,883) (94,962)
Deferred Sales Inducements, Net $ 1,292,341 $ 1,242,787 $ 1,227,328