Investments (Schedule of Unrealized Appreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Net change in unrealized appreciation on available-for-sale securities before deferred tax	$ 343	$ (3,225)
Deferred income tax	(117)	1,097
Net change in unrealized appreciation on available-for-sale securities	$ 226	$ (2,128)