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Policyholder Liabilities (Schedule of Changes in the Liability for Market Risk Benefits) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Market Risk Benefit Liability      
Beginning balance, market risk benefits $ 2,225,621    
Ending balance, market risk benefits 2,206,392 $ 2,225,621  
Fixed Rate Annuities      
Market Risk Benefit Liability      
Beginning balance, market risk benefits 37,863 78,411  
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 44,355 77,731  
Issuances 32 376  
Interest accrual 2,294 1,349  
Attributed fees collected 920 1,270  
Benefits payments 0 0  
Effect of changes in interest rates (8,338) (19,421)  
Effect of changes in equity markets 0 0  
Effect of changes in equity index volatility 0 0  
Actual policyholder behavior different from expected behavior 0 0  
Effect of changes in future expected policyholder behavior (250) 602  
Effect of changes in other future expected assumptions 16,720 (17,552)  
Balance, end of period, before effect of changes in the instrument-specific credit 55,733 44,355  
Effect of changes in the instrument-specific credit risk (5,134) (6,492)  
Ending balance, market risk benefits 50,599 37,863  
Reinsured MRB, end of period 15,776 10,656 $ 0
Balance, end of period, net of reinsurance 34,823 27,207  
Net amount at risk (a) $ 265,429 $ 258,826  
Weighted average attained age of contract holders (years) 70 years 69 years  
Fixed Index Annuities      
Market Risk Benefit Liability      
Beginning balance, market risk benefits $ 2,187,758 $ 2,557,378  
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 2,453,169 2,310,437  
Issuances 218,643 59,452  
Interest accrual 118,391 72,551  
Attributed fees collected 93,757 125,168  
Benefits payments 0 0  
Effect of changes in interest rates (401,074) (952,265)  
Effect of changes in equity markets (9,167) 186,618  
Effect of changes in equity index volatility (36,721) 241,563  
Actual policyholder behavior different from expected behavior 0 0  
Effect of changes in future expected policyholder behavior (948) 46,567  
Effect of changes in other future expected assumptions (219,094) 363,078  
Balance, end of period, before effect of changes in the instrument-specific credit 2,216,956 2,453,169  
Effect of changes in the instrument-specific credit risk (61,163) (265,411)  
Ending balance, market risk benefits 2,155,793 2,187,758  
Reinsured MRB, end of period 562,516 593,959 $ 156,931
Balance, end of period, net of reinsurance 1,593,277 1,593,799  
Net amount at risk (a) $ 11,673,620 $ 10,987,198  
Weighted average attained age of contract holders (years) 71 years 71 years