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Organization and Significant Accounting Policies Narrative (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Restatement Adjustment [Member]
Receipts credited to annuity policyholder account balances $ 914,936 $ 933,632 $ 45,800
Quantifying Error in Prior Year Financial Statements, Amount     $ 0