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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues: |  |  |
Research services | $ 202,998 | $ 191,648 | $ 168,508
Advisory services and other | 89,932 | 91,968 | 82,218
Total revenues | 292,930 | 283,616 | 250,726
Operating expenses: |  |  |
Cost of services and fulfillment | 111,228 | 103,571 | 94,105
Selling and marketing | 101,390 | 101,468 | 84,663
General and administrative | 36,866 | 33,284 | 33,960
Depreciation | 8,921 | 5,359 | 3,628
Amortization of intangible assets | 2,445 | 2,562 | 3,620
Reorganization costs | 1,421 | 375 |
Total operating expenses | 262,271 | 246,619 | 219,976
Income from operations | 30,659 | 36,997 | 30,750
Other income, net | 1,300 | 630 | 1,249
Gains (losses) on investments, net | (449) | 1,018 | 2,301
Income before income taxes | 31,510 | 38,645 | 34,300
Income tax provision | 5,936 | 15,635 | 13,793
Net income | $ 25,574 | $ 23,010 | $ 20,507
Basic income per common share | $ 1.14 | $ 1.02 | $ 0.91
Diluted income per common share | $ 1.12 | $ 0.99 | $ 0.89
Basic weighted average common shares outstanding | 22,500 | 22,666 | 22,478
Diluted weighted average common shares outstanding | 22,929 | 23,164 | 23,063

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