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Consolidated Condensed Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Product revenues $ 243,326 $ 266,400 $ 501,247 $ 530,986
Type of Revenue [Extensible List] us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember
Cost of sales $ 170,612 $ 189,308 $ 353,226 $ 372,652
Gross margin 72,714 77,092 148,021 158,334
Operating expenses:        
Net research and development expenses 19,255 21,022 38,152 44,326
Selling, general and administrative expenses 31,829 34,262 64,442 70,686
Acquisition transaction expenses 342   380  
Restructuring expenses 1,231 6,215 3,145 7,080
Total operating expenses 52,657 61,499 106,119 122,092
Operating income 20,057 15,593 41,902 36,242
Interest expense (1,240) (1,240) (2,608) (2,420)
Foreign currency (loss) gain (804) 5,174 (601) 596
Gain on sale of business     4,970  
Impairment loss (9,885)   (20,369)  
Other income 171 215 314 1,326
Earnings before income tax 8,299 19,742 23,608 35,744
Income tax expense 5,548 3,083 12,443 6,119
Net income $ 2,751 $ 16,659 $ 11,165 $ 29,625
Basic earnings per share $ 0.08 $ 0.46 $ 0.33 $ 0.81
Diluted earnings per share $ 0.08 $ 0.45 $ 0.33 $ 0.81
Weighted average number of shares – basic 33,440,764 36,523,742 33,508,479 36,560,193
Weighted average number of shares – diluted 33,573,608 36,666,999 33,651,117 36,663,226