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Consolidated Condensed Statements of Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Product revenues $ 228,613 $ 257,921
Type of Revenue [Extensible List] us-gaap:ProductMember us-gaap:ProductMember
Cost of sales $ 162,546 $ 182,614
Gross margin 66,067 75,307
Operating expenses:    
Net research and development expenses 17,760 18,897
Selling, general and administrative expenses 25,840 32,651
Restructuring expenses 3,766 1,914
Total operating expenses 47,366 53,462
Operating income 18,701 21,845
Interest expense, net (748) (1,368)
Foreign currency (loss) gain (938) 203
Gain on sale of business   4,970
Impairment loss   (10,484)
Other income 264 143
Earnings before income tax 17,279 15,309
Income tax expense 5,406 6,895
Net income $ 11,873 $ 8,414
Basic earnings per share $ 0.36 $ 0.25
Diluted earnings per share $ 0.36 $ 0.25
Weighted average number of shares – basic 32,692,895 33,573,411
Weighted average number of shares – diluted 32,869,149 33,733,335