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Reinsurance - Narrative (Details) - USD ($)
12 Months Ended
Mar. 30, 2010
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Retention Policy [Line Items]        
Amount of life insurance retained on the life of one person   $ 1,000,000    
Reinsurance, loss on uncollectible accounts in period, amount   0 $ 0 $ 0
Reinsurance recoverable on paid losses   24,600,000 28,600,000  
Benefits and claims ceded to reinsurers   $ 1,279,000,000.0 1,337,300,000 1,205,600,000
Deposit asset underlying 10% coinsurance agreement     $ 229,000,000.0 $ 217,300,000
Percentage of finance charge for statutory reserves   0.50%    
Pecan Re Inc [Member]        
Reinsurance Retention Policy [Line Items]        
Percentage of risks and rewards of term life insurance policies in force   10.00%    
IPO coinsurance agreements [Member]        
Reinsurance Retention Policy [Line Items]        
Percentage of risks and rewards of term life insurance policies in force   10.00%    
Minimum [Member] | IPO coinsurance agreements [Member]        
Reinsurance Retention Policy [Line Items]        
Percentage of risks and rewards of term life insurance policies in force 80.00%      
Maximum [Member] | IPO coinsurance agreements [Member]        
Reinsurance Retention Policy [Line Items]        
Percentage of risks and rewards of term life insurance policies in force 90.00%