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Investments - Net Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Gross realized investment gains $ 540 $ 195
Gross realized investment losses (612) (382)
Net realized investment (losses) $ (72) $ (187)