CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues	$ 189,078	$ 153,056	$ 518,755	$ 419,840
Cost of revenues	53,728	40,932	143,758	114,056
Gross margin	135,350	112,124	374,997	305,784
Operating expenses:
Selling and marketing	80,506	40,668	242,418	109,302
Software development	17,048	14,227	49,040	41,721
General and administrative	31,074	25,388	86,346	76,535
Purchase amortization	7,153	8,361	21,260	20,696
Total operating expenses	135,781	88,644	399,064	248,254
Income (loss) from operations	(431)	23,480	(24,067)	57,530
Interest and other income	42	46	473	245
Interest and other expense	(2,363)	(2,698)	(7,060)	(8,066)
Income (loss) before income taxes	(2,752)	20,828	(30,654)	49,709
Income tax expense (benefit), net	2,610	7,871	(4,199)	18,763
Net income (loss)	$ (5,362)	$ 12,957	$ (26,455)	$ 30,946
Net income (loss) per share-basic (in dollars per share)	$ (0.17)	$ 0.41	$ (0.83)	$ 1.04
Net income (loss) per share-diluted (in dollars per share)	$ (0.17)	$ 0.40	$ (0.83)	$ 1.03
Weighted average outstanding shares-basic (in shares)	31,980	31,742	31,934	29,692
Weighted average outstanding shares-diluted (in shares)	31,980	32,075	31,934	30,134