Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Product revenues	$ 243,384	$ 259,540	$ 797,924	$ 624,214
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 173,997	$ 176,935	$ 561,655	$ 448,807
Gross margin	69,387	82,605	236,269	175,407
Operating expenses:
Net research and development expenses	20,590	18,070	56,420	51,171
Selling, general and administrative expenses	27,344	25,745	83,093	73,474
Restructuring expenses	749	284	3,631	3,452
Total operating expenses	48,683	44,099	143,144	128,097
Operating income	20,704	38,506	93,125	47,310
Interest expense, net	(515)	(1,259)	(2,184)	(3,368)
Foreign currency gain (loss)	133	(2,883)	391	(5,562)
Other income (loss)	10	(615)	13	2,531
Earnings before income tax	20,332	33,749	91,345	40,911
Income tax expense	4,646	9,603	17,959	15,214
Net income	$ 15,686	$ 24,146	$ 73,386	$ 25,697
Basic earnings per share	$ 0.47	$ 0.74	$ 2.22	$ 0.79
Diluted earnings per share	$ 0.47	$ 0.73	$ 2.19	$ 0.78
Weighted average number of shares – basic	33,177,743	32,623,532	33,075,399	32,631,423
Weighted average number of shares – diluted	33,609,084	32,958,439	33,488,900	32,924,013