Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 111,996	$ 95,884	$ 90,585
Provision for income taxes	(39,182)	(34,829)	(33,126)
Total stock-based compensation, net of taxes	72,814	61,055	57,459
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	11,934	10,867	11,309
Research and development expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	19,341	17,472	17,275
Sales and marketing expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	47,570	39,290	34,322
General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 33,151	$ 28,255	$ 27,679