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Policyholder Liabilities - Schedule of Changes in the Liability for Market Risk Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Market Risk Benefit Liability      
Beginning balance, market risk benefit $ 2,225,621    
Ending balance, market risk benefit 2,422,881 $ 2,225,621  
Fixed Rate Annuities      
Market Risk Benefit Liability      
Beginning balance, market risk benefit 37,863 78,411  
Balance, beginning of year, before effect of changes in the instrument-specific credit risk 44,355 77,732  
Issuances 0 376  
Interest accrual 607 1,349  
Attributed fees collected 302 1,270  
Benefits payments 0 0  
Effect of changes in interest rates 2,973 (19,421)  
Effect of changes in equity markets 0 0  
Effect of changes in equity index volatility 0 0  
Effect of changes in future expected policyholder behavior 0 0  
Effect of changes in future expected policyholder behavior 714 602  
Effect of changes in other future expected assumptions 0 (17,553)  
Balance, end of year, before effect of changes in the instrument-specific credit 48,951 44,355  
Effect of changes in the instrument-specific credit risk (7,795) (6,492)  
Ending balance, market risk benefit 41,156 37,863  
Reinsured MRB, end of period 11,463 10,656 $ 0
Balance, end of period, net of reinsurance 29,693 27,207  
Net amount at risk (a) $ 262,643 $ 258,826  
Weighted average attained age of contract holders (years) 69 years 69 years  
Fixed Index Annuities      
Market Risk Benefit Liability      
Beginning balance, market risk benefit $ 2,187,758 $ 2,557,379  
Balance, beginning of year, before effect of changes in the instrument-specific credit risk 2,453,169 2,310,436  
Issuances 44,841 59,452  
Interest accrual 36,217 72,551  
Attributed fees collected 30,041 125,168  
Benefits payments 0 0  
Effect of changes in interest rates 172,165 (952,265)  
Effect of changes in equity markets (16,573) 186,618  
Effect of changes in equity index volatility (7,760) 241,563  
Effect of changes in future expected policyholder behavior 0 0  
Effect of changes in future expected policyholder behavior 3,738 46,567  
Effect of changes in other future expected assumptions 0 363,079  
Balance, end of year, before effect of changes in the instrument-specific credit 2,715,838 2,453,169  
Effect of changes in the instrument-specific credit risk (334,113) (265,411)  
Ending balance, market risk benefit 2,381,725 2,187,758  
Reinsured MRB, end of period 674,239 593,959 $ 156,931
Balance, end of period, net of reinsurance 1,707,486 1,593,799  
Net amount at risk (a) $ 11,120,564 $ 10,987,198  
Weighted average attained age of contract holders (years) 71 years 71 years