Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Total revenues	$ 102,140	$ 102,996	$ 292,309	$ 292,963
Costs and expenses
Cost of goods sold	4,819	4,207	12,547	11,168
Research and development	16,943	20,422	49,307	59,368
Selling, general and administrative	40,649	40,892	122,700	117,838
Total costs and expenses	62,411	65,521	184,554	188,374
Operating earnings	39,729	37,475	107,755	104,589
Other income (expenses), net	(139)	(1,104)	(1,180)	(3,180)
Earnings before income taxes	39,590	36,371	106,575	101,409
Income tax expense	10,730	8,360	26,648	16,309
Net earnings	$ 28,860	$ 28,011	$ 79,927	$ 85,100
Earnings per share
Basic (in dollars per share)	$ 0.55	$ 0.54	$ 1.53	$ 1.64
Diluted (in dollars per share)	$ 0.54	$ 0.52	$ 1.48	$ 1.57
Weighted-average shares outstanding
Basic (in shares)	52,453,384	52,227,630	52,392,232	51,897,240
Diluted (in shares)	53,805,838	54,239,847	53,898,486	54,098,330
Net product sales
Revenues
Total revenues	$ 100,034	$ 100,227	$ 285,491	$ 286,377
Royalty revenues
Revenues
Total revenues	2,106	2,769	6,818	5,836
Licensing revenues
Revenues
Total revenues	$ 0	$ 0	$ 0	$ 750