CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based compensation	$ 242,417	$ 178,068	$ 85,011
Cost of revenue
Stock-based compensation	11,388	5,307	3,921
Selling and marketing
Stock-based compensation	46,654	33,164	18,067
Technology and content
Stock-based compensation	63,536	26,766	22,100
General and administrative
Stock-based compensation	108,149	80,082	40,923
General and administrative
Stock-based compensation	$ 12,690	$ 32,749	$ 0