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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

X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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- Definition

Amount of expenses related to the generation of investment income.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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