Supplemental Financial Information (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Details of Product Revenue
Product sales made through direct sales force	77.10%	[1]	76.60%	[1]	77.00%	[1]	78.50%	[1]
Product sales made through distributors	22.90%	[2]	23.40%	[2]	23.00%	[2]	21.50%	[2]
Total product sales	100.00%		100.00%		100.00%		100.00%

[1] Includes 9.5% and 5.7% of product sales maintained under hubbing arrangements with certain of our customers in the three months ended June 30, 2011 and 2010, respectively, and 9.2% and 5.6% in the six months ended June 30, 2011 and 2010, respectively.

[2] Includes 5.8% and 8.1% of product sales maintained under fulfillment distributor arrangements in the three months ended June 30, 2011 and 2010, respectively, and 6.9% and 6.7% in the six months ended June 30, 2011 and 2010, respectively.