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Deferred Policy Acquisition Costs and Deferred Sales Inducements Deferred Policy Acuisition Costs (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Costs $ 1,683,857 $ 1,747,760 $ 1,625,785
Deferred Policy Acquisitions Costs, Commissions Deferred 399,001 463,889 390,631
Deferred Policy Acquisition Costs, Policy Issue Costs Deferred 4,410 14,945 11,976
Amortization of deferred policy acquisition costs (164,919) (143,478) (136,388)
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) (212,550) (399,259) (144,244)
Deferred Policy Acquisition Costs $ 1,709,799 $ 1,683,857 $ 1,747,760