Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Total revenues		$ 155,135	$ 102,140	$ 376,840	$ 292,309
Costs and expenses
Cost of goods sold	[1]	21,388	4,819	33,926	12,547
Research and development		16,839	16,943	58,023	49,307
Selling, general and administrative		54,660	39,343	144,377	118,782
Amortization of intangible assets		6,108	1,306	9,814	3,918
Total costs and expenses		98,995	62,411	246,140	184,554
Operating earnings		56,140	39,729	130,700	107,755
Other income (expense)
Interest income		3,262	5,559	12,988	15,696
Interest expense		(6,088)	(5,662)	(17,658)	(16,930)
Other income (expense), net		(603)	(36)	2,925	54
Total other expense		(3,429)	(139)	(1,745)	(1,180)
Earnings before income taxes		52,711	39,590	128,955	106,575
Income tax expense		12,714	10,730	32,773	26,648
Net earnings		$ 39,997	$ 28,860	$ 96,182	$ 79,927
Earnings per share
Basic (in dollars per share)		$ 0.76	$ 0.55	$ 1.83	$ 1.53
Diluted (in dollars per share)		$ 0.74	$ 0.54	$ 1.79	$ 1.48
Weighted-average shares outstanding
Basic (in shares)		52,658,850	52,453,384	52,583,891	52,392,232
Diluted (in shares)		53,762,642	53,805,838	53,663,273	53,898,486
Net product sales
Revenues
Total revenues		$ 152,133	$ 100,034	$ 368,607	$ 285,491
Royalty revenues
Revenues
Total revenues		$ 3,002	$ 2,106	$ 8,233	$ 6,818

[1] Excludes amortization of acquired intangible assets