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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Fixed index annuity derivatives, fair value accounting impact on comparability of net income	$ 71,133	$ (923,874)	$ 332,519	$ (94,557)	$ (100,305)	$ 196,396	$ 78,397	$ 118,491

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1570-108306

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