Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Research services	$ 55,023	$ 52,604	$ 108,271	$ 104,462
Advisory services and events	32,798	30,207	56,951	53,536
Total revenues	87,821	82,811	165,222	157,998
Operating expenses:
Cost of services and fulfillment	34,417	32,560	65,540	63,321
Selling and marketing	29,335	28,481	59,739	58,112
General and administrative	10,300	9,276	20,273	19,034
Depreciation	2,076	2,096	4,041	4,203
Amortization of intangible assets	210	224	419	445
Reorganization costs	11	81	1,026	3,505
Total operating expenses	76,349	72,718	151,038	148,620
Income from operations	11,472	10,093	14,184	9,378
Other income (expense), net	473	(99)	145	183
Gains (losses) on investments, net	(54)	10	(54)	(9)
Income before income taxes	11,891	10,004	14,275	9,552
Income tax provision	4,431	4,254	5,526	4,026
Net income	$ 7,460	$ 5,750	$ 8,749	$ 5,526
Basic income per common share	$ 0.42	$ 0.32	$ 0.49	$ 0.31
Diluted income per common share	$ 0.41	$ 0.31	$ 0.49	$ 0.30
Basic weighted average common shares outstanding	17,863	18,007	17,812	18,033
Diluted weighted average common shares outstanding	18,145	18,268	18,035	18,314
Cash dividends declared per common share	$ 0.18	$ 0.17	$ 0.36	$ 0.34