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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.