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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues        
Total revenues $ 231,353 $ 221,038 $ 427,232 $ 383,181
Operating expenses        
Cost of sales 39,607 50,070 67,936 85,240
Amortization of intangibles 17,762 17,835 35,525 35,670
Research and development 21,038 19,727 40,149 37,706
Selling, general and administrative 35,711 38,948 70,845 76,305
Total operating expenses 114,118 126,580 214,455 234,921
Operating income 117,235 94,458 212,777 148,260
Other income (expense)        
Investment and other income, net 5,032 3,192 10,025 6,171
Interest expense (4,524) (4,494) (9,031) (9,037)
Net income before income taxes 117,743 93,156 213,771 145,394
Income tax expense 24,498 18,402 43,703 31,025
Net income $ 93,245 $ 74,754 $ 170,068 $ 114,369
Earnings per share        
Basic (usd per share) $ 0.73 $ 0.57 $ 1.34 $ 0.86
Diluted (usd per share) $ 0.72 $ 0.56 $ 1.32 $ 0.84
Weighted average common shares outstanding        
Basic (in shares) 127,116 131,730 127,029 133,369
Diluted (in shares) 129,222 133,543 129,097 135,758
Royalties        
Revenues        
Total revenues $ 124,918 $ 111,740 $ 245,511 $ 211,380
Product sales, net        
Revenues        
Total revenues 78,886 73,889 137,469 134,683
Revenues under collaborative agreements        
Revenues        
Total revenues $ 27,549 $ 35,409 $ 44,252 $ 37,118