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Share-based compensation plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based compensation
Share-based compensation expense	$ 6,648	$ 8,138	$ 10,752
Cost of sales
Share-based compensation
Share-based compensation expense	153	210	677
Selling and marketing expense
Share-based compensation
Share-based compensation expense	2,031	3,505	3,045
General and administrative expense
Share-based compensation
Share-based compensation expense	4,322	4,105	6,467
Research and development expense
Share-based compensation
Share-based compensation expense	$ 142	$ 318	$ 563

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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