Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Carrying value of inventories	$ 2,474	$ 2,400
Accrued liabilities and allowances deductible for tax purposes on a cash basis	6,387	5,663
Goodwill	2,732	4,814
Stock-based compensation	2,359	3,856
Net operating loss carryforwards	22,096	38,988
Tax credit carryforwards	2,007	8,688
Other	5,924	6,812
Gross deferred tax assets	43,979	71,221
Less: valuation allowance	(15,823)	(16,026)
Net deferred tax assets	28,156	55,195
Plant and equipment, due to differences in depreciation	(8,543)	(11,499)
Intangible assets, due to differences in amortization	(20,891)	(35,492)
Other	(1,715)	(1,632)
Gross deferred tax liability	(31,149)	(48,623)
Net deferred tax asset (liability)	(2,993)
Net deferred tax asset (liability)		6,572
Non-current deferred tax assets	4,034	6,572
Long-term liability	(7,027)	0
Total	$ 2,993
Total		$ 6,572