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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 | 3 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |
Fixed index annuity derivatives, fair value accounting impact on comparability of net income (loss) | $ 3,518 | $ 30,806 | $ 37,075 | $ 7,069 | $ (66,618) | $ 6,054 | $ 34,215 | $ 62,822

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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=84173487&loc=d3e1570-108306 + Details
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