Income Taxes (Schedule Of Income Tax Reconciliation Items) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Expected tax provision	$ (14,873)	$ 490	$ 3,668
Foreign tax rate differential	(1,159)	1,269	1,874
Change in valuation allowance	11,424	19,950	(451)
State and local tax provision	418	6,595	378
Prior year adjustments	877	85	40
Tax rate change	(1,397)
Unrecognized tax benefits	246	257	438
Impact of Tax Act			(2,265)
GILTI		103	193
Foreign Tax Credit		(81)	(846)
Other	(503)	169	269
Total income tax expense (benefit)	$ (4,967)	$ 28,837	$ 3,298