Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Federal	$ (531)	$ 312	$ (2,083)
State	86	56	(4)
Foreign	531	2,338	1,372
Current income tax expense (benefit)	86	2,706	(715)
Federal	(19,304)	3,090	5,406
State	3,172	238	19
Foreign	1,185	(2,190)	(458)
Deferred income tax expense (benefit)	(14,947)	1,138	4,967
Total income tax expense (benefit)	$ (14,861)	$ 3,844	$ 4,252