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Investments Realized Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (Loss) on Securities [Line Items]        
Realized gains, fixed-maturity securities $ 189 $ 24 $ 244 $ 24
Realized losses, fixed-maturity securities (4) 0 (4) (32)
Net realized gains (losses), fixed-maturity securities 185 24 240 (8)
Realized gains, equity securities 0   57  
Realized losses, equity securities (11)   (11)  
Net realized gains (losses), equity securities (11)   46  
Net realized investment gains $ 174 24 $ 286 (8)
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