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Segment Information and Concentrations of Risk (Details 2)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net revenues by geographic region
Net revenues by geographic region	100.00%	100.00%	100.00%
United States and Canada [Member]
Net revenues by geographic region
Net revenues by geographic region	93.10%	93.50%	95.00%
Latin America [Member]
Net revenues by geographic region
Net revenues by geographic region	2.40%	0.00%	0.00%
Europe, Middle East and Africa [Member]
Net revenues by geographic region
Net revenues by geographic region	4.10%	4.00%	4.70%
Asia and Australia [Member]
Net revenues by geographic region
Net revenues by geographic region	0.40%	2.50%	0.30%

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- Definition

Revenue from external customers by geographic region.

+ References

No definition available.

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