Income Taxes (Income Before Income Tax Domestic And Foreign Components Table) (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic							$ (34,608)	$ 4,081
Foreign							7,897	5,970
(Loss) income before income taxes	$ 6,426	$ 6,162	$ (1,333)	$ 4,566	$ 3,691	$ (2,002)	$ (26,711)	$ 10,051