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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues:        
Research services $ 50,512 $ 51,072 $ 100,890 $ 100,832
Advisory services and other 27,652 28,021 48,773 48,521
Total revenues 78,164 79,093 149,663 149,353
Operating expenses:        
Cost of services and fulfillment 30,786 29,828 57,813 56,766
Selling and marketing 26,789 26,267 53,846 51,400
General and administrative 8,420 8,645 17,907 18,256
Depreciation 2,302 2,255 4,662 4,248
Amortization of intangible assets 554 586 1,113 1,200
Reorganization costs 314 51 1,905 1,394
Total operating expenses 69,165 67,632 137,246 133,264
Income from operations 8,999 11,461 12,417 16,089
Other income, net 255 130 631 539
Gains (losses) on investments, net (51) 84 (102) 143
Income before income taxes 9,203 11,675 12,946 16,771
Income tax provision 3,581 3,906 4,983 5,821
Net income $ 5,622 $ 7,769 $ 7,963 $ 10,950
Basic income per common share $ 0.26 $ 0.34 $ 0.37 $ 0.48
Diluted income per common share $ 0.26 $ 0.34 $ 0.36 $ 0.47
Basic weighted average common shares outstanding 21,256 22,583 21,781 22,660
Diluted weighted average common shares outstanding 21,747 23,023 22,202 23,098
Cash dividends declared per common share $ 0.15 $ 0.14 $ 0.30 $ 0.28