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Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues:    
Research services $ 49,760 $ 44,547
Advisory services and other 20,500 21,195
Total revenues 70,260 65,742
Operating expenses:    
Cost of services and fulfillment 26,938 25,498
Selling and marketing 25,133 25,465
General and administrative 9,611 8,918
Depreciation 1,993 970
Amortization of intangible assets 614 693
Reorganization costs 1,343  
Total operating expenses 65,632 61,544
Income from operations 4,628 4,198
Other income (expense), net 409 (109)
Gains on investments, net 59 582
Income before income taxes 5,096 4,671
Income tax provision 1,915 1,760
Net income $ 3,181 $ 2,911
Basic income per common share $ 0.14 $ 0.13
Diluted income per common share $ 0.14 $ 0.13
Basic weighted average common shares outstanding 22,738 22,713
Diluted weighted average common shares outstanding 23,173 23,252
Cash dividends declared per common share $ 0.14