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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:      
Research services $ 210,268 $ 207,517 $ 202,843
Advisory services and events 103,458 104,545 94,807
Total revenues 313,726 312,062 297,650
Operating expenses:      
Cost of services and fulfillment 126,261 126,199 117,061
Selling and marketing 116,081 115,753 107,073
General and administrative 39,041 38,584 38,280
Depreciation 8,192 9,325 9,268
Amortization of intangible assets 891 2,171 2,230
Reorganization costs 4,433 1,817 1,905
Total operating expenses 294,899 293,849 275,817
Income from operations 18,827 18,213 21,833
Other income, net 511 464 592
Losses on investments, net (18) (288) (2,433)
Income before income taxes 19,320 18,389 19,992
Income tax provision 7,324 7,524 6,968
Net income $ 11,996 $ 10,865 $ 13,024
Basic income per common share $ 0.67 $ 0.58 $ 0.62
Diluted income per common share $ 0.66 $ 0.57 $ 0.61
Basic weighted average common shares outstanding 17,927 18,713 20,861
Diluted weighted average common shares outstanding 18,143 19,007 21,353