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Quarterly Financial Information Comparability of Net Income, Impact of Applicaiton of Fair Value Accounting to Fixed Index Annuity Business (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2010
Derivative [Line Items] |  |  |  |  |  |  |  |
Fixed Index Annuity Derivatives, Fair Value Accounting Impact on Comparability of Net Income | $ (8,270) | $ 18,106 | $ 5,058 | $ 16,279 | $ (21,313) | $ 45,868 | $ 9,747 | $ (2,945)

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- Definition Amount of the item included in the interim period that affected period-to-period comparability (excluding restatement adjustments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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