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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment Income, Net [Abstract] |  |  |  |
Investment income | $ 7,741 | $ 5,937 | $ 15,237 | $ 10,719
Investment expenses | (112) | (202) | (225) | (410)
Net investment income | $ 7,629 | $ 5,735 | $ 15,012 | $ 10,309

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