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Quarterly Financial Information (Unaudited) (Comparability of Net Income, Impact 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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |
Fixed index annuity derivatives, fair value accounting impact on comparability of net income | $ (23,418) | $ (5,601) | $ (80,658) | $ 10,973 | $ (8,289) | $ 18,148 | $ 5,070 | $ 16,317

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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=25249566&loc=d3e1570-108306 + Details
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