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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - Fair Value, Recurring Measurements [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Level 3 assets, beginning of period		$ 567	$ 8,162
Net unrealized gains (losses) included in other comprehensive income		(8)	232
Realized gains (losses) and accretion (amortization) recognized in earnings, including OTTI		38	26
Purchases		500
Settlements		(169)	(958)
Transfers out of Level 3	[1]	(7)	(6,895)
Level 3 assets, end of period		$ 921	$ 567
[1] During the year ended December 31, 2017, transfers out of Level 3 assets primarily consisted of newly issued fixed-maturity securities purchased in the fourth quarter of 2016 for which observable inputs, most notably quoted prices, used to derive valuations were not yet readily available.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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