Stockholders' Equity (Details2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock-based compensation related to stock-based awards to employees and nonemployees
Total stock-based compensation	$ 144,943	$ 145,491	$ 291,047	$ 248,600
Tax benefit from stock-based compensation	(305)	(36,479)	(669)	(66,583)
Total stock-based compensation, net of tax effect	144,638	109,012	290,378	182,017
Cost of revenue [Member]
Stock-based compensation related to stock-based awards to employees and nonemployees
Total stock-based compensation	14,773	11,946	29,242	21,703
Sales and marketing [Member]
Stock-based compensation related to stock-based awards to employees and nonemployees
Total stock-based compensation	27,684	23,417	56,164	42,758
Product development [Member]
Stock-based compensation related to stock-based awards to employees and nonemployees
Total stock-based compensation	71,647	59,847	141,832	109,817
General and administrative [Member]
Stock-based compensation related to stock-based awards to employees and nonemployees
Total stock-based compensation	$ 30,839	$ 50,281	$ 63,809	$ 74,322