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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
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 $ 2,342,305   $ 0
Investment gain realized, net of tax $ 106,900      
Separate account asset   2,308,134   2,001,128
Separate account liability   $ 2,308,134   $ 2,001,128
Reinsurance Deposit Receivable | Third Party Reinsurer Risk        
Effects of Reinsurance [Line Items]        
Concentration risk, percent   50.00%    
Reinsurance Contract Modified Coinsurance Basis        
Effects of Reinsurance [Line Items]        
Separate account asset   $ 700,000    
Separate account liability   $ 700,000    
Minimum        
Effects of Reinsurance [Line Items]        
Minimum crediting rating   4.50%