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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues:      
Research services $ 191,648 $ 168,508 $ 157,726
Advisory services and other 91,968 82,218 75,626
Total revenues 283,616 250,726 233,352
Operating expenses:      
Cost of services and fulfillment 103,571 94,105 87,873
Selling and marketing 101,468 84,663 72,487
General and administrative 33,284 33,960 28,461
Depreciation 5,359 3,628 4,380
Amortization of intangible assets 2,562 3,620 2,290
Reorganization costs 375   5,441
Total operating expenses 246,619 219,976 200,932
Income from operations 36,997 30,750 32,420
Other income, net 630 1,249 2,297
Gains (losses) on investments, net 1,018 2,301 (982)
Income before income taxes 38,645 34,300 33,735
Income tax provision 15,635 13,793 14,869
Net income $ 23,010 $ 20,507 $ 18,866
Basic income per common share $ 1.02 $ 0.91 $ 0.83
Diluted income per common share $ 0.99 $ 0.89 $ 0.82
Basic weighted average common shares outstanding 22,666 22,478 22,645
Diluted weighted average common shares outstanding 23,164 23,063 22,884