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Investments - Net Effect on Stockholders' Equity of Unrealized Gains and Losses on Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Net unrealized investment gains on available-for-sale securities including OTTI, Available-for-sale securities	$ 1,934	$ 60,292	[1]
OTTI	172	174
Net unrealized investment gains on available-for-sale securities excluding OTTI	2,106	60,466
Less deferred income taxes	(613)	(20,780)
Net unrealized investment gains on available-for-sale securities excluding OTTI, net of tax	$ 1,493	$ 39,686
[1] Includes $9.8 million of net unrealized gains for equity securities recognized in accumulated other comprehensive income (loss) prior to the adoption of ASU 2016-01.

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Accumulated unrealized gain (loss), after tax, on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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