Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Research services	$ 49,242	$ 42,895	$ 141,130	$ 123,063
Advisory services and other	20,532	16,882	67,836	60,547
Total revenues	69,774	59,777	208,966	183,610
Operating expenses:
Cost of services and fulfillment	25,071	22,399	78,593	69,026
Selling and marketing	24,927	20,228	76,401	61,036
General and administrative	7,928	9,489	25,176	24,413
Depreciation	1,420	943	3,335	2,740
Amortization of intangible assets	679	905	1,898	2,715
Total operating expenses	60,025	53,964	185,403	159,930
Income from operations	9,749	5,813	23,563	23,680
Other income (expense), net	378	(945)	273	1,278
Gains on investments, net	8	1,377	648	1,829
Income before income taxes	10,135	6,245	24,484	26,787
Income tax provision	4,403	2,541	10,371	10,409
Net income	$ 5,732	$ 3,704	$ 14,113	$ 16,378
Basic income per common share	$ 0.25	$ 0.16	$ 0.62	$ 0.73
Diluted income per common share	$ 0.25	$ 0.16	$ 0.61	$ 0.71
Basic weighted average common shares outstanding	22,620	22,462	22,672	22,456
Diluted weighted average common shares outstanding	23,082	23,107	23,179	23,040