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Deposit Asset on Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 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 2,315,330 $ 0
Investment gain realized, net of tax $ 106,900    
Separate account asset   2,310,886 2,001,128
Separate account liability   $ 2,310,886 $ 2,001,128
Reinsurance Deposit Receivable [Member] | Third Party Reinsurer Risk [Member]      
Effects of Reinsurance [Line Items]      
Concentration risk, percent   50.00%  
Reinsurance Contract Modified Coinsurance Basis [Member]      
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%