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Consolidated Condensed Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Product revenues $ 267,657 $ 288,535
Type of Revenue [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Cost of sales $ 203,544 $ 200,866
Gross margin 64,113 87,669
Operating expenses:    
Net research and development expenses 20,434 17,603
Selling, general and administrative expenses 29,308 28,526
Restructuring expenses 181 791
Total operating expenses 49,923 46,920
Operating income 14,190 40,749
Interest expense, net (569) (1,039)
Foreign currency gain 2,217 773
Other income (loss) 204 (9)
Earnings before income tax 16,042 40,474
Income tax expense 4,295 7,565
Net income $ 11,747 $ 32,909
Basic earnings per share $ 0.36 $ 1.00
Diluted earnings per share $ 0.35 $ 0.99
Weighted average number of shares – basic 33,034,872 32,945,970
Weighted average number of shares – diluted 33,376,764 33,389,591