Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Total revenues	$ 77,749	$ 77,194
Operating expenses:
Cost of services and fulfillment	34,105	31,396
Selling and marketing	33,011	30,622
General and administrative	10,739	10,170
Depreciation	1,996	1,679
Amortization of intangible assets	186	191
Total operating expenses	80,037	74,058
Income (loss) from operations	(2,288)	3,136
Other income (expense), net	(118)	9
Losses on investments, net	(25)	(203)
Income (loss) before income taxes	(2,431)	2,942
Income tax benefit	(698)	(88)
Net income (loss)	$ (1,733)	$ 3,030
Basic income (loss) per common share	$ (0.10)	$ 0.17
Diluted income (loss) per common share	$ (0.10)	$ 0.16
Basic weighted average common shares outstanding	18,036	18,230
Diluted weighted average common shares outstanding	18,036	18,536
Cash dividends declared per common share	$ 0.20	$ 0.19
Research Services [Member]
Revenues:
Total revenues	$ 51,700	$ 51,743
Advisory Services and Events [Member]
Revenues:
Total revenues	$ 26,049	$ 25,451