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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
	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

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