Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Research services	$ 54,575	$ 55,023	$ 106,318	$ 108,271
Advisory services and events	35,158	32,798	60,609	56,951
Total revenues	89,733	87,821	166,927	165,222
Operating expenses:
Cost of services and fulfillment	36,910	34,417	68,306	65,540
Selling and marketing	30,508	29,335	61,130	59,739
General and administrative	10,419	10,300	20,589	20,273
Depreciation	1,489	2,076	3,168	4,041
Amortization of intangible assets	194	210	385	419
Reorganization costs		11		1,026
Total operating expenses	79,520	76,349	153,578	151,038
Income from operations	10,213	11,472	13,349	14,184
Other income, net	93	473	102	145
Losses on investments, net	(22)	(54)	(225)	(54)
Income before income taxes	10,284	11,891	13,226	14,275
Income tax provision	4,220	4,431	4,132	5,526
Net income	$ 6,064	$ 7,460	$ 9,094	$ 8,749
Basic income per common share	$ 0.34	$ 0.42	$ 0.51	$ 0.49
Diluted income per common share	$ 0.34	$ 0.41	$ 0.50	$ 0.49
Basic weighted average common shares outstanding	17,715	17,863	17,973	17,812
Diluted weighted average common shares outstanding	18,050	18,145	18,293	18,035
Cash dividends declared per common share	$ 0.19	$ 0.18	$ 0.38	$ 0.36