Derivative Instruments (Change in Fair Value of Derivatives Included in the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	$ (941,874)	$ 384,469
Change in fair value of embedded derivatives	(1,250,061)	766,323
Call Options
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	(941,936)	385,166
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	0	(368)
Interest Rate Caps
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of derivatives	62	(329)
Fixed Index Annuities - Embedded Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value of embedded derivatives	(1,285,071)	652,642
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	$ 35,010	$ 113,681

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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=109980867&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=109980867&loc=SL5624171-113959

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- Definition

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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