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Segment Information and Concentrations of Risk (Details 2)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net revenues by geographic region
Net revenues by geographic region	100.00%	100.00%	100.00%	100.00%
United States and Canada [Member]
Net revenues by geographic region
Net revenues by geographic region	94.00%	95.20%	92.70%	95.50%
Latin America [Member]
Net revenues by geographic region
Net revenues by geographic region			2.20%
Europe / Middle East / Africa [Member]
Net revenues by geographic region
Net revenues by geographic region	5.70%	4.50%	4.70%	4.30%
Asia/Australia [Member]
Net revenues by geographic region
Net revenues by geographic region	0.30%	0.30%	0.40%	0.20%

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- Definition

Revenue from external customers by geographic region.

+ References

No definition available.

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