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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Product revenues $ 971,684 $ 1,048,505 $ 993,991
Type of Revenue [Extensible List] us-gaap:ProductMember us-gaap:ProductMember us-gaap:ProductMember
Cost of sales $ 683,349 $ 743,647 $ 674,796
Gross margin 288,335 304,858 319,195
Operating expenses:      
Research and development expenses 91,033 98,663 94,515
Reimbursed research and development expenses (18,557) (18,763) (12,037)
Net research and development expenses 72,476 79,900 82,478
Selling, general and administrative expenses 118,680 137,398 139,619
Restructuring expenses 12,919 14,772  
Total operating expenses 204,075 232,070 222,097
Operating income 84,260 72,788 97,098
Interest expense, net (4,763) (4,942) (4,885)
Foreign currency gain (loss) 2,326 622 (23,108)
Asset impairments and net loss on divestitures (22,793) (11,476)  
Other income 121 1,127 150
Earnings before income tax 59,151 58,119 69,255
Income tax expense 21,645 16,220 34,028
Net income $ 37,506 $ 41,899 $ 35,227
Basic earnings per share $ 1.13 $ 1.17 $ 0.96
Diluted earnings per share $ 1.13 $ 1.16 $ 0.96
Weighted average number of shares – basic 33,120,076 35,920,782 36,720,749
Weighted average number of shares – diluted 33,297,589 36,177,144 36,813,719