Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Carrying value of inventories	$ 3,212	$ 2,787
Accrued liabilities and allowances deductible for tax purposes on a cash basis	8,945	6,108
Goodwill	1,976	2,351
Stock-based compensation	2,500	2,347
Operating right-of-use lease liabilities	19,087	0
Net operating loss carryforwards	19,493	20,028
Tax credit carryforwards	2,421	1,923
Other	5,148	4,373
Gross deferred tax assets	62,782	39,917
Less: valuation allowance	(15,992)	(13,709)
Net deferred tax assets	46,790	26,208
Plant and equipment, due to differences in depreciation	(10,428)	(7,617)
Operating right-of-use lease assets	(18,826)	0
Intangible assets, due to differences in amortization	(16,302)	(18,593)
Foreign withholding tax	(7,181)	(9,212)
Other	(2,283)	(2,631)
Gross deferred tax liability	(55,020)	(38,053)
Net deferred tax liability	(8,230)	(11,845)
Long-term asset	5,274	2,478
Long-term liability	(13,504)	(14,323)
Net deferred tax liability	$ (8,230)	$ (11,845)