Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 148,246	$ 128,670	$ 273,217	$ 242,451
Operating expenses:
Selling and marketing	44,974	42,556	89,018	81,835
General and administrative	15,925	14,334	31,449	27,512
Depreciation	2,299	2,255	4,618	4,545
Amortization of intangible assets	3,354	3,968	6,716	7,871
Integration costs	0	216	0	334
Total operating expenses	127,543	115,587	246,043	221,832
Income from operations	20,703	13,083	27,174	20,619
Interest expense	(535)	(1,066)	(1,148)	(2,195)
Other income (expense), net	103	(201)	(154)	(671)
Net gains from investments	0	0	426	0
Income before income taxes	20,271	11,816	26,298	17,753
Income tax expense	6,397	3,473	8,276	5,454
Net income	$ 13,874	$ 8,343	$ 18,022	$ 12,299
Basic income per common share	$ 0.74	$ 0.44	$ 0.95	$ 0.64
Diluted income per common share	$ 0.72	$ 0.43	$ 0.94	$ 0.64
Basic weighted average common shares outstanding	18,871	19,126	18,929	19,094
Diluted weighted average common shares outstanding	19,173	19,377	19,218	19,332
Research [Member]
Revenues:
Total revenues	$ 89,447	$ 81,002	$ 175,227	$ 155,970
Consulting [Member]
Revenues:
Total revenues	39,262	40,960	77,693	79,510
Events [Member]
Revenues:
Total revenues	19,537	6,708	20,297	6,971
Cost of Services and Fulfillment [Member]
Operating expenses:
Cost of services and fulfillment	$ 60,991	$ 52,258	$ 114,242	$ 99,735