Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Research services	$ 50,300	$ 49,242	$ 151,132	$ 141,130
Advisory services and other	18,211	20,532	66,732	67,836
Total revenues	68,511	69,774	217,864	208,966
Operating expenses:
Cost of services and fulfillment	25,736	25,071	82,502	78,593
Selling and marketing	24,309	24,927	75,709	76,401
General and administrative	8,411	7,928	26,667	25,176
Depreciation	2,262	1,420	6,510	3,335
Amortization of intangible assets	579	679	1,779	1,898
Reorganization costs	37		1,431
Total operating expenses	61,334	60,025	194,598	185,403
Income from operations	7,177	9,749	23,266	23,563
Other income, net	357	378	896	273
Gains on investments, net	147	8	290	648
Income before income taxes	7,681	10,135	24,452	24,484
Income tax provision (benefit)	(2,692)	4,403	3,129	10,371
Net income	$ 10,373	$ 5,732	$ 21,323	$ 14,113
Basic income per common share	$ 0.46	$ 0.25	$ 0.94	$ 0.62
Diluted income per common share	$ 0.45	$ 0.25	$ 0.93	$ 0.61
Basic weighted average common shares outstanding	22,398	22,620	22,573	22,672
Diluted weighted average common shares outstanding	22,858	23,082	23,018	23,179
Cash dividends declared per common share	$ 0.14		$ 0.42