Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Carrying value of inventories	$ 5,882	$ 2,786
Accrued liabilities and allowances deductible for tax purposes on a cash basis	5,742	8,956
Goodwill	13,346	10,526
Stock-based compensation	7,169	8,251
Net operating loss carryforwards	40,915	39,670
Tax credit carryforwards	5,970	5,848
Other	7,394	7,564
Gross deferred tax assets	86,418	83,601
Less: valuation allowance	(30,312)	(41,858)
Net deferred tax assets	56,106	41,743
Plant and equipment, due to differences in depreciation	(5,063)	(3,887)
Other	(7,956)	(1,188)
Gross deferred tax liability	(13,019)	(5,075)
Net deferred tax assets	43,087	36,668
Current deferred tax assets	11,302	8,889
Non-current deferred tax assets	33,856	29,535
Non-current deferred tax liabilities	$ (2,071)	$ (1,756)