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Share-Based Compensation (Schedule of Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based compensation expense before taxes	$ 19,540	$ 13,592	$ 9,747
Income tax benefit	4,231	2,856	2,913
Net share-based compensation expense	15,309	10,736	6,834
Cost of Sales [Member]
Share-based compensation expense before taxes	1,672	932	799
Research and Development Expense [Member]
Share-based compensation expense before taxes	3,055	2,087	1,826
Selling and Marketing Expense [Member]
Share-based compensation expense before taxes	4,285	2,885	1,936
General and Administrative [Member]
Share-based compensation expense before taxes	$ 10,528	$ 7,688	$ 5,186

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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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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