Investments (Schedule of Unrealized Appreciation) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Investments [Abstract]
Net change in unrealized appreciation on available-for-sale securities before deferred tax	$ (1,444)	$ 3,123
Deferred income tax	491	(1,062)
Net change in unrealized appreciation on available-for-sale securities	$ (953)	$ 2,061