Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock-based compensation expense	$ 2,425	$ 3,647	$ 5,333	$ 6,943
Cost Of Goods Sold [Member]
Stock-based compensation expense	202	313	579	665
Cost Of Goods Sold [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Stock-based compensation expense	23	78	87	155
Cost Of Goods Sold [Member] | RSUs [Member]
Stock-based compensation expense	179	235	492	510
Research And Development [Member]
Stock-based compensation expense	412	399	919	740
Research And Development [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Stock-based compensation expense	71	69	132	144
Research And Development [Member] | RSUs [Member]
Stock-based compensation expense	341	330	787	596
Sales And Marketing [Member]
Stock-based compensation expense	878	870	1,817	1,679
Sales And Marketing [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Stock-based compensation expense	151	120	281	218
Sales And Marketing [Member] | RSUs [Member]
Stock-based compensation expense	727	750	1,536	1,461
General And Administrative [Member]
Stock-based compensation expense	933	2,065	2,018	3,859
General And Administrative [Member] | Option And SAR Grants And Stock Purchase Rights [Member]
Stock-based compensation expense	29	152	274	673
General And Administrative [Member] | RSUs [Member]
Stock-based compensation expense	904	1,913	1,744	3,186
Option And SAR Grants And Stock Purchase Rights [Member]
Stock-based compensation expense	274	419	774	1,190
RSUs [Member]
Stock-based compensation expense	$ 2,151	$ 3,228	$ 4,559	$ 5,753