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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues:    
Total revenues $ 1,408,869 $ 1,262,740
Costs and expenses:    
Cost of services and product development 435,139 377,033
Selling, general and administrative 657,090 617,904
Depreciation 23,896 23,201
Amortization of intangibles 22,735 25,148
Acquisition and integration charges 1,368 2,207
Gain from sale of divested operation (139,316) 0
Total costs and expenses 1,000,912 1,045,493
Operating income 407,957 217,247
Interest expense, net (27,391) (31,394)
Gain on event cancellation insurance claims 3,077 0
Other (expense) income, net (2,366) 29,206
Income before income taxes 381,277 215,059
Provision for income taxes 85,494 42,544
Net income $ 295,783 $ 172,515
Net income per share:    
Basic (in dollars per share) $ 3.72 $ 2.10
Diluted (in dollars per share) $ 3.68 $ 2.08
Weighted average shares outstanding:    
Basic (in shares) 79,452 82,020
Diluted (in shares) 80,282 82,973
Research    
Revenues:    
Total revenues $ 1,217,191 $ 1,136,380
Conferences    
Revenues:    
Total revenues 64,642 10,354
Consulting    
Revenues:    
Total revenues $ 127,036 $ 116,006