Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Carrying value of inventories	$ 2,704	$ 3,470
Accrued liabilities and allowances deductible for tax purposes on a cash basis	10,592	13,086
Goodwill	1,320	1,704
Stock-based compensation	3,741	2,559
Operating right-of-use lease liabilities	24,851	20,003
Net operating loss carryforwards	17,417	19,120
Tax credit carryforwards	4,629	3,368
Interest rate swap liabilities	1,133	2,263
Other	5,961	5,025
Gross deferred tax assets	72,348	70,598
Less: valuation allowance	(18,702)	(19,038)
Net deferred tax assets	53,646	51,560
Plant and equipment, due to differences in depreciation	(4,887)	(7,899)
Operating right-of-use lease assets	(24,590)	(19,742)
Intangible assets, due to differences in amortization	(11,687)	(14,078)
Foreign withholding tax	(4,902)	(6,102)
Other	(1,692)	(3,603)
Gross deferred tax liability	(47,758)	(51,424)
Net deferred tax liability	5,888	136
Long-term asset	5,972	4,924
Long-term liability	(84)	(4,788)
Net deferred tax Asset	$ 5,888	$ 136