Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Carrying value of inventories	$ 2,400	$ 4,391
Accrued liabilities and allowances deductible for tax purposes on a cash basis	5,663	6,052
Goodwill	4,814	8,035
Stock-based compensation	3,856	6,723
Net operating loss carryforwards	38,988	35,879
Tax credit carryforwards	8,688	8,121
Other	6,812	9,009
Gross deferred tax assets	71,221	78,210
Less: valuation allowance	(16,026)	(17,202)
Net deferred tax assets	55,195	61,008
Plant and equipment, due to differences in depreciation	(11,499)	(6,138)
Intangible assets, due to differences in amortization	(35,492)	(39,060)
Other	(1,632)	(1,722)
Gross deferred tax liability	(48,623)	(46,920)
Net deferred tax asset	$ 6,572	$ 14,088