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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenues:        
Research services $ 49,855 $ 50,509 $ 151,445 $ 151,145
Advisory services and other 19,960 18,264 68,684 66,725
Total revenues 69,815 68,773 220,129 217,870
Operating expenses:        
Cost of services and fulfillment 27,584 25,736 85,397 82,502
Selling and marketing 25,771 24,309 79,617 75,709
General and administrative 9,310 8,720 27,217 27,124
Depreciation 2,292 2,262 6,954 6,510
Amortization of intangible assets 557 579 1,670 1,779
Reorganization costs    37 1,905 1,431
Total operating expenses 65,514 61,643 202,760 195,055
Income from operations 4,301 7,130 17,369 22,815
Other income (expense), net (71) 357 560 896
Gains (losses) on investments, net 18 755 (84) 898
Income before income taxes 4,248 8,242 17,845 24,609
Income tax provision (benefit) 1,813 (2,468) 7,056 3,191
Net income $ 2,435 $ 10,710 $ 10,789 $ 21,418
Basic income per common share $ 0.12 $ 0.48 $ 0.51 $ 0.95
Diluted income per common share $ 0.12 $ 0.47 $ 0.50 $ 0.93
Basic weighted average common shares outstanding 20,117 22,398 21,226 22,573
Diluted weighted average common shares outstanding 20,665 22,858 21,690 23,018
Cash dividends declared per common share $ 0.15 $ 0.14 $ 0.45 $ 0.42