Supplemental Financial Information (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Details of Product Revenue
Product sales made through direct sales force	76.60%	[1]	77.60%	[1]	76.90%	[1]	78.20%	[1]
Product sales made through distributors	23.40%	[2]	22.40%	[2]	23.10%	[2]	21.80%	[2]
Total product sales	100.00%		100.00%		100.00%		100.00%

[1] Includes 8.6% and 8.3% of product sales maintained under hubbing arrangements with certain of our customers in the three months ended September 30, 2011 and 2010, respectively, and 9.0% and 6.6% in the nine months ended September 30, 2011 and 2010, respectively.

[2] Includes 8.1% and 8.6% of product sales maintained under fulfillment distributor arrangements in the three months ended September 30, 2011 and 2010, respectively, and 7.3% and 7.4% in the nine months ended September 30, 2011 and 2010, respectively.