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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Deferred Policy Acquisition Costs) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 1,709,799 $ 1,683,857 $ 1,747,760
Costs deferred during the year: commissions 420,378 399,001 463,889
Costs deferred during the year: policy issue costs 5,422 4,410 14,945
Amortization (365,468) (164,919) (143,478)
Effect of net unrealized gains/losses 656,521 (212,550) (399,259)
Balance at end of year $ 2,426,652 $ 1,709,799 $ 1,683,857