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Stockholders' Equity (Schedule of Stock Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	$ 15,141	$ 18,589	$ 42,465	$ 57,973
Less: Income tax benefit	(5,746)	(6,350)	(15,119)	(21,349)
Total stock-based compensation, net of taxes	9,395	12,239	27,346	36,624
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	634	702	1,779	2,110
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	4,927	5,338	14,059	17,979
Sales and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	6,951	8,862	19,112	26,662
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	2,629	3,687	7,515	11,222
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	3,312	3,843	10,518	11,240
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	0	0	1,885	1,885
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	12,628	15,615	31,276	47,208
1999 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	1,142	1,049	4,192	3,237
Capitalized Internal Use Software [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation before income taxes	$ (1,941)	$ (1,918)	$ (5,406)	$ (5,597)

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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