Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Product revenues	$ 288,535	$ 228,613
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 200,866	$ 162,546
Gross margin	87,669	66,067
Operating expenses:
Net research and development expenses	17,603	17,760
Selling, general and administrative expenses	28,526	25,840
Restructuring expenses	791	3,766
Total operating expenses	46,920	47,366
Operating income	40,749	18,701
Interest expense, net	(1,039)	(748)
Foreign currency gain (loss)	773	(938)
Other (loss) income	(9)	264
Earnings before income tax	40,474	17,279
Income tax expense	7,565	5,406
Net income	$ 32,909	$ 11,873
Basic earnings per share	$ 1.00	$ 0.36
Diluted earnings per share	$ 0.99	$ 0.36
Weighted average number of shares – basic	32,945,970	32,692,895
Weighted average number of shares – diluted	33,389,591	32,869,149