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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:      
Research services $ 215,216 $ 210,268 $ 207,517
Advisory services and events 110,879 103,458 104,545
Total revenues 326,095 313,726 312,062
Operating expenses:      
Cost of services and fulfillment 128,175 126,261 126,199
Selling and marketing 116,898 116,081 115,753
General and administrative 40,579 39,041 38,584
Depreciation 7,812 8,192 9,325
Amortization of intangible assets 831 891 2,171
Reorganization costs 1,026 4,433 1,817
Total operating expenses 295,321 294,899 293,849
Income from operations 30,774 18,827 18,213
Other income, net 740 511 464
Losses on investments, net (805) (18) (288)
Income before income taxes 30,709 19,320 18,389
Income tax provision 13,058 7,324 7,524
Net income $ 17,651 $ 11,996 $ 10,865
Basic income per common share $ 0.98 $ 0.67 $ 0.58
Diluted income per common share $ 0.97 $ 0.66 $ 0.57
Basic weighted average common shares outstanding 17,984 17,927 18,713
Diluted weighted average common shares outstanding 18,269 18,143 19,007