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Investments - Change in Unrealized Gains (Losses) of Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]              
Equity securities $ 443 $ 3,603 $ 2,965 $ 3,437 $ (6,036)    
Net (decrease) increase         (341) $ 2,226 $ 2,209
Fixed maturity securities              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities         $ (341) (6) (60)
Equity securities              
Debt Securities, Available-for-sale [Line Items]              
Equity securities           $ 2,232 $ 2,269