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Derivative Instruments (Change in Fair Value of Derivatives Included in the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | $ 396,305 | $ (941,874)
Change in fair value of embedded derivatives | (282,413) | (1,250,061)
Call Options |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | 396,276 | (941,936)
Warrants |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | 29 | 0
Interest Rate Caps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | 0 | 62
Fixed Index Annuities - Embedded Derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of embedded derivatives | (377,121) | (1,285,071)
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 | $ 94,708 | $ 35,010

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- Definition 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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 + Details
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