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Derivative Instruments (Change in Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	$ 1,348,735	$ 34,666	$ 906,906
Change in fair value of embedded derivatives	(358,302)	(1,286,787)	1,454,042
Call Options
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	1,347,925	34,604	908,556
Warrants
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	810	0	0
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	0	0	(1,059)
Interest Rate Caps
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	0	62	(591)
Fixed Index Annuities - Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of embedded derivatives	(876,803)	(1,922,085)	562,302
Other Changes in Difference Between Policy Benefit Reserves Computed Using Derivative Accounting Vs. Long-Duration Contracts Accounting
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of embedded derivatives	520,863	635,298	891,740
Reinsurance Related Embedded Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of embedded derivatives	$ (2,362)	$ 0	$ 0

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2229187

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