Income Taxes (Components of Income (Loss) before Taxes from Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 78,468	$ 37,316	$ 40,176
Foreign	(560)	12,667	(3,076)
Income before taxes	$ 77,908	$ 49,983	$ 37,100