Income Taxes (Income Before Income Tax Domestic And Foreign Components Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 2,072	$ (151,027)	$ (55,061)
Foreign	5,970	3,858	4,484
Income (loss) before income taxes	$ 8,042	$ (147,169)	$ (50,577)