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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment [Line Items]      
Gross investment income $ 58,933 $ 1,075  
External investment expense (901) (44)  
Net Investment Income 58,032 1,031 $ 0
Fixed Maturities      
Investment [Line Items]      
Net Investment Income 54,685 964  
Equity securities      
Investment [Line Items]      
Net Investment Income 2,263 93  
Mortgage loans      
Investment [Line Items]      
Net Investment Income 491 0  
Policy loans      
Investment [Line Items]      
Net Investment Income 1,173 18  
Other invested assets      
Investment [Line Items]      
Net Investment Income $ 321 $ 0