CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues	$ 170,657	$ 147,708	$ 329,677	$ 266,784
Cost of revenues	44,634	39,481	90,030	73,124
Gross margin	126,023	108,227	239,647	193,660
Operating expenses:
Selling and marketing	92,434	40,889	161,912	68,634
Software development	16,844	15,143	31,992	27,494
General and administrative	29,909	26,250	55,272	51,147
Purchase amortization	6,965	9,036	14,107	12,335
Total operating expenses	146,152	91,318	263,283	159,610
Income (loss) from operations	(20,129)	16,909	(23,636)	34,050
Interest and other income	137	62	431	199
Interest and other expense	(2,354)	(3,753)	(4,697)	(5,368)
Income (loss) before income taxes	(22,346)	13,218	(27,902)	28,881
Income tax expense (benefit), net	(7,380)	4,969	(6,809)	10,892
Net income (loss)	$ (14,966)	$ 8,249	$ (21,093)	$ 17,989
Net income (loss) per share-basic (in dollars per share)	$ (0.47)	$ 0.28	$ (0.66)	$ 0.63
Net income (loss) per share-diluted (in dollars per share)	$ (0.47)	$ 0.28	$ (0.66)	$ 0.62
Weighted average outstanding shares-basic (in shares)	31,991	29,061	31,911	28,667
Weighted average outstanding shares-diluted (in shares)	31,991	29,486	31,911	29,163