Consolidated Statements Of Operations (USD $) In Thousands, except Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Revenue:
Net revenue	$ 95,793		$ 63,128		$ 262,035		$ 181,820
Operating expenses:
Cost of revenue	52,803	[1]	32,837	[1]	145,942	[1]	96,977	[1]
Product development	3,661	[1]	3,354	[1]	10,903	[1]	10,291	[1]
Selling, general and administrative	32,285	[1]	24,526	[1]	93,340	[1]	77,036	[1]
Total operating expenses	88,749		60,717		250,185		184,304
Income (loss) from operations	7,044		2,411		11,850		(2,484)
Interest income	71		132		270		381
Interest expense	(334)		(36)		(578)		(155)
Other income	72		190		176		1,090
Realized gain on securities					409		582
Income (loss) before (provision for) benefit from income taxes	6,853		2,697		12,127		(586)
(Provision for) benefit from income taxes, net	(1,492)		(1,515)		20,128		(800)
Net income (loss)	$ 5,361		$ 1,182		$ 32,255		$ (1,386)
Basic net income (loss) per share	$ 0.13		$ 0.03		$ 0.78		$ (0.03)
Diluted net income (loss) per share	$ 0.13		$ 0.03		$ 0.76		$ (0.03)
Weighted average common stock outstanding (basic)	41,396,431		40,404,126		41,146,197		40,246,374
Weighted average common stock outstanding (diluted)	42,497,367		41,354,680		42,366,861		40,246,374

[1] Stock-based compensation expense recorded for the three and nine months ended September 30, 2011 and 2010 was classified as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2011 2010 2011 2010 Cost of revenue $ 456 $ 438 $ 1,308 $ 1,279 Product development 176 164 548 471 Selling, general and administrative 2,113 2,248 6,857 6,929