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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues:        
Total revenues $ 1,503,185 $ 1,376,521 $ 2,912,054 $ 2,639,261
Costs and expenses:        
Cost of services and product development 487,418 424,535 922,557 801,568
Selling, general and administrative 680,168 604,911 1,337,258 1,222,815
Depreciation 23,712 22,910 47,608 46,111
Amortization of intangibles 22,901 24,754 45,636 49,902
Acquisition and integration charges 1,973 2,289 3,341 4,496
Gain from sale of divested operation 3,906 0 (135,410) 0
Total costs and expenses 1,220,078 1,079,399 2,220,990 2,124,892
Operating income 283,107 297,122 691,064 514,369
Interest expense, net (24,558) (29,719) (51,949) (61,113)
Gain on event cancellation insurance claims 0 0 3,077 0
Other income, net 5,575 8,548 3,209 37,754
Income before income taxes 264,124 275,951 645,401 491,010
Provision for income taxes 66,081 71,026 151,575 113,570
Net income $ 198,043 $ 204,925 $ 493,826 $ 377,440
Net income per share:        
Basic (in dollars per share) $ 2.50 $ 2.55 $ 6.22 $ 4.65
Diluted (in dollars per share) $ 2.48 $ 2.53 $ 6.17 $ 4.60
Weighted average shares outstanding:        
Basic (in shares) 79,285 80,271 79,368 81,145
Diluted (in shares) 79,820 80,974 80,015 82,011
Research        
Revenues:        
Total revenues $ 1,207,885 $ 1,142,329 $ 2,425,076 $ 2,278,709
Conferences        
Revenues:        
Total revenues 168,897 113,525 233,539 123,879
Consulting        
Revenues:        
Total revenues $ 126,403 $ 120,667 $ 253,439 $ 236,673