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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Apr. 01, 2019
Effects of Reinsurance [Line Items]        
Reinsurance block of in-force fixed and variable annuity business $ 2,900,000      
Fixed annuity reserves reinsured on a coinsurance basis       $ 2,200,000
Deposit asset on reinsurance   $ 2,420,926 $ 2,346,166 2,300,000
Investment gain realized, net of tax $ 106,900      
Separate account asset   2,891,423 2,490,469  
Separate account liability   2,891,423 2,490,469  
Interest accrued on reinsurance deposit   $ 97,300 $ 70,800  
Reinsurance Contract Modified Coinsurance Basis        
Effects of Reinsurance [Line Items]        
Separate account asset       700,000
Separate account liability       $ 700,000
Reinsurance Deposit Receivable | Third Party Reinsurer Risk        
Effects of Reinsurance [Line Items]        
Concentration risk, percent 50.00%      
Minimum        
Effects of Reinsurance [Line Items]        
Minimum crediting rating 4.50%