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Derivative Instruments (Change in Fair Value of Derivatives Not Designated as Hedging) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of embedded derivatives | $ (451,806) | $ (415,374) | [1] | $ 166,398 | $ (2,695,007) | [1]
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | (383,026) | (150,924) |  | (103,493) | (1,128,302) |
Change in fair value of embedded derivatives | (451,806) | (415,374) |  | 166,398 | (2,695,007) |
Not Designated as Hedging Instrument | Call Options |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | (383,026) | (162,308) |  | (104,699) | (1,142,521) |
Not Designated as Hedging Instrument | Warrants |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 0 | 83 |  | 1,206 | 262 |
Not Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of derivatives | 0 | 11,301 |  | 0 | 13,957 |
Not Designated as Hedging Instrument | Fixed index annuities - embedded derivatives |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of embedded derivatives | (323,080) | (299,144) |  | 250,494 | (2,176,911) |
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Change in fair value of embedded derivatives | $ (128,726) | $ (116,230) |  | $ (84,096) | $ (518,096) |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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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 -Topic 815 -SubTopic 15 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//815-15/tableOfContent + Details
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