CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock-based compensation	$ 50,102	$ 100,431	$ 97,313	$ 149,339
Cost of revenue
Stock-based compensation	2,727	2,884	5,566	5,292
Selling and marketing
Stock-based compensation	10,363	25,454	21,094	32,496
Technology and content
Stock-based compensation	14,599	28,820	27,637	39,441
General and administrative
Stock-based compensation	22,413	42,803	43,016	60,467
Restructuring and related reorganization charges
Stock-based compensation	$ 0	$ 470	$ 0	$ 11,643