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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) |  |  |
Net sales | $ 480,154 | $ 571,710 | $ 524,067
Cost of sales | 351,874 | 402,893 | 369,177
Gross profit | 128,280 | 168,817 | 154,890
Selling, general, and administrative expense | 64,617 | 71,288 | 69,958
Impairment charges | 127,872 |  |
Intangibles amortization | 10,931 | 10,956 | 11,472
Income (loss) from operations | (75,140) | 86,573 | 73,460
Interest expense, net | (20,238) | (16,782) | (16,943)
Debt modification expense | (3,542) |  |
Pension termination |  | (6,609) |
Other income (expense), net | 91 | (565) | (758)
Income (Loss) before taxes | (98,829) | 62,617 | 55,759
Income tax expense (benefit) | (12,276) | 13,451 | 11,854
Net income (loss) | $ (86,553) | $ 49,166 | $ 43,905
Earnings (loss) per share: |  |  |
Basic earnings (loss) per common share attributable to common shareholders (in dollars per share) | $ (3.81) | $ 2.13 | $ 1.91
Earnings (loss) per common share assuming dilution attributable to common shareholders (in dollars per share) | (3.81) | 2.11 | 1.89
Cash dividends declared per share (in dollars per share) | 1.12 | 1.09 | 1.06
Cash dividends declared per share (in dollars per share) | $ 1.12 | $ 1.09 | $ 1.06

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