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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |
Net sales | $ 648,006 | $ 834,289 | $ 866,199
Costs and expenses: |  |  |
Cost of goods sold | 493,810 | 620,556 | 609,568
Selling, general and administrative | 112,474 | 123,853 | 138,553
Gain on disposal of Non-core Products, net |  | (33,599) |
Design and development | 49,386 | 52,198 | 51,074
Operating income | (7,664) | 71,281 | 67,004
Interest expense, net | 6,124 | 4,324 | 4,720
Equity in loss (earnings) of investee | (1,536) | (1,578) | (2,038)
Other income , net | (1,528) | 142 | (736)
(Loss) income before income taxes | (10,724) | 68,393 | 65,058
(Benefit) provision for income taxes | (2,774) | 8,102 | 11,210
Net (loss) income | $ (7,950) | $ 60,291 | $ 53,848
(Loss) earnings per share: |  |  |
Basic (in dollars per share) | $ (0.29) | $ 2.17 | $ 1.90
Diluted (in dollars per share) | $ (0.29) | $ 2.13 | $ 1.85
Weighted-average shares outstanding: |  |  |
Basic (in shares) | 27,024,571 | 27,791,799 | 28,402,227
Diluted (in shares) | 27,024,571 | 28,270,095 | 29,079,826

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