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Investments - Net Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Gross realized investment gains $ 59 $ 188 $ 59 $ 467
Gross realized investment losses 0 0 0 (337)
Net realized investment gains (losses) $ 59 $ 188 $ 59 $ 130