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Investments Realized Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Gain (Loss) on Securities [Line Items]        
Realized gains, fixed-maturity securities $ 0 $ 44 $ 244 $ 68
Realized losses, fixed-maturity securities (6) 0 (10) (32)
Net realized gains (losses), fixed-maturity securities (6) 44 234 36
Realized gains, equity securities 0   57  
Realized losses, equity securities 0   (11)  
Net realized gains (losses), equity securities 0   46  
Net realized investment gains $ (6) 44 $ 280 36
Equity securities [Member]        
Gain (Loss) on Securities [Line Items]        
Realized gains, available for sale   0   0
Realized losses, available for sale   0   0
Net realized gains (losses), available for sale   $ 0   $ 0