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Organization and Significant Accounting Policies Narrative (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Receipts credited to annuity policyholder account balances $ 2,033,484 $ 1,808,845
Restatement Adjustment [Member]
   
Receipts credited to annuity policyholder account balances   87,900
Quantifying Error in Prior Year Financial Statements, Amount   $ 0