Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Subscription revenues	$ 584,075	$ 553,810	$ 499,557
Service and other revenues	99,030	65,734	40,834
Total revenues	683,105	619,544	540,391
Costs of revenues:
Cost of subscription revenues	103,051	95,899	86,889
Cost of service and other revenues	60,668	43,654	28,553
Total cost of revenues	163,719	139,553	115,442
Gross profit	519,386	479,991	424,949
Operating expenses:
Technology and development	97,105	94,221	85,723
Marketing and advertising	171,094	168,536	145,103
General and administrative	54,427	60,971	55,691
Amortization of acquired intangible assets	109,318	147,681	185,193
Total operating expenses	431,944	471,409	471,710
Income (loss) from operations	87,442	8,582	(46,761)
Interest expense, net	(81,056)	(69,680)	(97,837)
Other expense, net	(334)	(368)	(655)
Income (loss) before income taxes	6,052	(61,466)	(145,253)
Income tax benefit	23,366	42,738	65,553
Net income (loss)	$ 29,418	$ (18,728)	$ (79,700)