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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
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Fixed index annuity derivatives, fair value accounting impact on comparability of net income (loss)	$ (66,618)	$ 6,054	$ 34,215	$ 62,822	$ 11,091	$ (53,716)	$ (28,596)	$ 42,849

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- References

No definition available.

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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=68076893&loc=d3e1570-108306

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