Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Carrying value of inventories	$ 2,787	$ 2,474
Accrued liabilities and allowances deductible for tax purposes on a cash basis	6,108	6,387
Goodwill	2,351	2,732
Stock-based compensation	2,347	2,359
Net operating loss carryforwards	20,028	22,096
Tax credit carryforwards	1,923	2,007
Other	4,373	5,924
Gross deferred tax assets	39,917	43,979
Less: valuation allowance	(13,709)	(15,823)
Net deferred tax assets	26,208	28,156
Plant and equipment, due to differences in depreciation	(7,617)	(8,543)
Intangible assets, due to differences in amortization	(18,593)	(20,891)
ASC 606 revenue recognition	(1,640)	(1,667)
Foreign withholding tax	(9,212)	0
Other	(991)	(1,715)
Gross deferred tax liability	(38,053)	(32,816)
Net deferred tax liability	(11,845)	(4,660)
Non-current deferred tax assets	2,478	4,034
Long-term liability	(14,323)	(8,694)
Net deferred tax liability	$ (11,845)	$ (4,660)