Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,480	$ 2,971	$ 7,813	$ 9,914
Cost Of Goods Sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	168	383	747	1,048
Cost Of Goods Sold [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	20	70	107	226
Cost Of Goods Sold [Member] | RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	148	313	640	822
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	376	484	1,295	1,224
Research And Development [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	55	55	187	199
Research And Development [Member] | RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	321	429	1,108	1,025
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	869	1,103	2,686	2,782
Sales And Marketing [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	124	110	405	329
Sales And Marketing [Member] | RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	745	993	2,281	2,453
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,067	1,001	3,085	4,860
General And Administrative [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	310	218	584	891
General And Administrative [Member] | RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	757	783	2,501	3,969
Option And SAR Grants And Stock Purchase Rights [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	509	453	1,283	1,645
RSUs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,971	$ 2,518	$ 6,530	$ 8,269