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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues    
Total revenues $ 195,879 $ 162,143
Operating expenses    
Cost of sales 28,329 35,170
Amortization of intangibles 17,763 17,835
Research and development 19,111 17,979
Selling, general and administrative 35,134 37,357
Total operating expenses 100,337 108,341
Operating income 95,542 53,802
Other income (expense)    
Investment and other income, net 4,993 2,979
Interest expense (4,507) (4,543)
Net income before income taxes 96,028 52,238
Income tax expense 19,205 12,623
Net income $ 76,823 $ 39,615
Earnings per share    
Basic (USD per share) $ 0.61 $ 0.29
Diluted (USD per share) $ 0.60 $ 0.29
Weighted average common shares outstanding    
Basic (shares) 126,941 135,027
Diluted (shares) 128,887 137,900
Royalties    
Revenues    
Total revenues $ 120,593 $ 99,640
Product sales, net    
Revenues    
Total revenues 58,583 60,794
Revenues under collaborative agreements    
Revenues    
Total revenues $ 16,703 $ 1,709