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Significant Accounting Policies (Schedule of Long-Duration Contracts) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for future policy benefits, adjustment | $ 303,200 | $ 318,677 |  | $ 402,305 |
Market risk benefits, after increase (decrease) from instrument-specific credit risk | 2,666,860 | 2,225,621 |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs | 3,070,280 | 2,773,643 | [1] | 3,062,204 |
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements | 2,367,224 | 2,045,683 | [1] | $ 2,119,962 |
Retained earnings | 4,852,448 | 4,685,593 | [1] |  |
Accumulated other comprehensive loss | $ (2,979,657) | $ (3,746,230) | [1] |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Retained earnings |  |  |  |  | $ 7,200
Accumulated other comprehensive loss |  |  |  |  | 1,800,000
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for future policy benefits, adjustment |  |  |  |  | 408,750
Market Risk Benefit Liability |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 2,225,484
Ceded Market Risk Benefit (a) |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 89,338
Fixed Index Annuities and Fixed Rate Annuities |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 3,408,505
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements |  |  |  |  | 2,216,685
As Reported | Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for future policy benefits, adjustment |  |  |  |  | 337,467
As Reported | Market Risk Benefit Liability |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 2,547,231
As Reported | Ceded Market Risk Benefit (a) |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 62,108
As Reported | Fixed Index Annuities and Fixed Rate Annuities |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 2,225,199
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements |  |  |  |  | 1,448,375
Adjustment to opening retained earnings for expected future policy benefits | Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for future policy benefits, adjustment |  |  |  |  | 2,566
Adjustment for the effect of remeasurement of liability at current single A rate | Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Liability for future policy benefits, adjustment |  |  |  |  | 68,717
Adjustment for the removal of shadow adjustments | Market Risk Benefit Liability |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | (584,636)
Adjustment for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date | Market Risk Benefit Liability |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 229,108
Adjustment for the remaining difference between previous carrying amount and fair value measurement for the MRB, exclusive of the instrument specific credit risk | Market Risk Benefit Liability |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 33,781
Adjustment for the remaining difference between previous carrying amount and fair value measurement for the MRB, exclusive of the instrument specific credit risk | Ceded Market Risk Benefit (a) |  |  |  |  |
Liability for Future Policy Benefits for Payout Annuity With Life Contingency |  |  |  |  |
Market risk benefits, after increase (decrease) from instrument-specific credit risk |  |  |  |  | 27,230
Adjustments for the removal of shadow adjustments | Fixed Index Annuities and Fixed Rate Annuities |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs |  |  |  |  | 1,183,306
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements |  |  |  |  | $ 768,310
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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