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Recoverable from Reinsurers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Ceded Credit Risk [Line Items]      
Amount $ 1,305,038 $ 1,305,038 $ 526,337
Cash proceeds received from recapture of reinsurance treaties 158,500    
Amount of ceded reinsurance reduced from recapture of reinsurance treaties 140,800    
Gain recognized from recapture of reinsurance treaties 17,700    
Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   100.00% 100.00%
Hannover Life Reassurance Company of America | A Plus Rating      
Ceded Credit Risk [Line Items]      
Amount 338,438 $ 338,438 $ 336,852
Hannover Life Reassurance Company of America | A Plus Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   25.90% 64.00%
Munich American Reassurance Company | A Plus Rating      
Ceded Credit Risk [Line Items]      
Amount 331,390 $ 331,390 $ 0
Munich American Reassurance Company | A Plus Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   25.40% 0.00%
ManhattanLife Assurance Company of America | B Plus Rating      
Ceded Credit Risk [Line Items]      
Amount 278,339 $ 278,339 $ 0
ManhattanLife Assurance Company of America | B Plus Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   21.30% 0.00%
Loyal American Life Insurance Company | A Rating      
Ceded Credit Risk [Line Items]      
Amount 144,246 $ 144,246 $ 140,552
Loyal American Life Insurance Company | A Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   11.10% 26.70%
General Re Life Corporation | A Plus Plus Rating      
Ceded Credit Risk [Line Items]      
Amount 142,411 $ 142,411
General Re Life Corporation | A Plus Plus Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   10.90% 0.00%
Great American Life Insurance Company | A Rating      
Ceded Credit Risk [Line Items]      
Amount 52,997 $ 52,997 $ 48,933
Great American Life Insurance Company | A Rating | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   4.10% 9.30%
Other      
Ceded Credit Risk [Line Items]      
Amount $ 17,217 $ 17,217 $ 0
Other | Percentage of Total, Reinsurance recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Recoverable from reinsurers assets percent   1.30% 0.00%