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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 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 2,300,000   $ 2,373,267 $ 2,346,166
Investment gain realized, net of tax $ 106,900      
Separate account asset     2,316,900 2,490,469
Separate account liability     2,316,900 $ 2,490,469
Reinsurance Contract Modified Coinsurance Basis        
Effects of Reinsurance [Line Items]        
Separate account asset     $ 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%