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Consolidated Statements of Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Net sales | $ 863,717 | $ 779,839 | $ 709,868
Cost of goods sold | 567,937 | 479,271 | 431,182
Gross profit | 295,780 | 300,568 | 278,686
Selling, general and administrative expenses | 164,964 | 160,112 | 146,192
Technical and research expenses | 41,174 | 40,304 | 44,753
Restructuring expenses, net | 13,491 | 8,376 | 23,846
Operating income | 76,151 | 91,776 | 63,895
Interest income | (1,511) | (2,077) | (1,857)
Interest expense | 18,602 | 15,541 | 11,841
Other expense, net | 4,352 | 46 | 2,433
Income before income taxes | 54,708 | 78,266 | 51,478
Income tax expense/(benefit) | 22,123 | 25,454 | (5,787)
Net income | 32,585 | 52,812 | 57,265
Net (loss)/income attributable to the noncontrolling interest | (526) | 79 | (14)
Net income attributable to the Company | $ 33,111 | $ 52,733 | $ 57,279
Earnings per share attributable to Company shareholders - Basic | $ 1.03 | $ 1.64 | $ 1.79
Earnings per share attributable to Company shareholders - Diluted | 1.03 | 1.64 | 1.79
Dividends declared per share, Class A and Class B | $ 0.68 | $ 0.68 | $ 0.67

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