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Derivative Instruments (Change in Fair Value of Derivatives Not Designated as Hedging) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of embedded derivatives | $ 1,143,576 | $ (2,352,598) | [1],[2] | $ (358,302) | [1],[2]
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of derivatives | 249,950 | (1,104,547) |  | 1,348,735 |
Change in fair value of embedded derivatives | 1,143,576 | (2,352,598) |  | (358,302) |
Not Designated as Hedging Instrument | Call Options |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of derivatives | 248,744 | (1,118,768) |  | 1,347,925 |
Not Designated as Hedging Instrument | Warrants |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of derivatives | 1,206 | 264 |  | 810 |
Not Designated as Hedging Instrument | Interest Rate Swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of derivatives | 0 | 13,957 |  | 0 |
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of embedded derivatives | 958,488 | (1,913,096) |  | (355,940) |
Not Designated as Hedging Instrument | Reinsurance Related Embedded Derivative |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in fair value of embedded derivatives | $ 185,088 | $ (439,502) |  | $ (2,362) |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.
[2] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC + 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 -Topic 815 -SubTopic 15 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//815-15/tableOfContent + Details
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