CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net revenues	$ 181,709	$ 159,978
Cost of net revenues	108,723	94,707
Gross profit	72,986	65,271
Operating expenses:
Technology and development	38,269	37,360
Sales and marketing	45,842	44,530
General and administrative	30,689	29,605
Total operating expenses	114,800	111,495
Loss from operations	(41,814)	(46,224)
Interest expense	(5,675)	(4,736)
Interest and other income, net	121	102
Loss before income taxes	(47,368)	(50,858)
Benefit from income taxes	17,932	5,755
Net loss	$ (29,436)	$ (45,103)
Net loss per share - basic and diluted (in dollars per share)	$ (0.85)	$ (1.19)
Weighted-average shares outstanding - basic and diluted	34,596	37,968
Cost of net revenues
Stock-based compensation	$ 1,224	$ 1,192
Technology and development
Stock-based compensation	459	1,992
Sales and marketing
Stock-based compensation	4,279	6,219
General and administrative
Stock-based compensation	$ 4,188	$ 8,357