Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Information on reportable segments for reconciliation to consolidated net income
Revenue	$ 92,870	$ 56,257	$ 309,449	$ 162,199
Cost of revenue	69,973	38,755	193,747	108,008
Operating Expense	17,193	8,734	58,629	34,718
Stock-based compensation			6,637	4,488
Depreciation	560	475	1,627	1,689
Amortization of intangible assets	3,169		8,450
Other loss, net	(5,196)	(456)	(7,681)	(274)
Income tax expense	936	1,289	14,049	4,927
Loss from discontinued operations, net of tax				(2,253)
Net income (loss)	(2,398)	2,075	18,706	(1,280)
Search [Member]
Information on reportable segments for reconciliation to consolidated net income
Revenue	91,408	56,257	248,511	162,199
Cost of revenue	65,203	36,329	176,545	99,031
Operating Expense	9,849	9,119	27,159	29,730
Segment income	16,356	10,809	44,807	33,438
Segment margin	18.00%	19.00%	18.00%	21.00%
Tax Preparation [Member]
Information on reportable segments for reconciliation to consolidated net income
Revenue	1,462		60,938
Cost of revenue	292		4,410
Operating Expense	2,731		24,000
Segment income	(1,561)		32,528
Segment margin	(107.00%)		53.00%
Total Segment [Member]
Information on reportable segments for reconciliation to consolidated net income
Revenue	92,870	56,257	309,449	162,199
Cost of revenue	65,495	36,329	180,955	99,031
Operating Expense	12,580	9,119	51,159	29,730
Segment income	14,795	10,809	77,335	33,438
Segment margin	16.00%	19.00%	25.00%	21.00%
Corporate [Member]
Information on reportable segments for reconciliation to consolidated net income
Operating Expense	2,695	2,307	9,026	6,980
Stock-based compensation	2,195	3,049	10,923	6,420
Depreciation	988	1,115	2,895	3,942
Amortization of intangible assets	5,183	518	14,055	2,248
Other loss, net	5,196	456	7,681	274
Income tax expense	936	1,289	14,049	4,927
Loss from discontinued operations, net of tax				$ 9,927