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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net sales | $ 500,153 | $ 567,080 | [1] | $ 487,076 | [1]
Cost of sales | 400,245 | 458,253 |  | 399,721 |
Gross profit | 99,908 | 108,827 |  | 87,355 |
Selling, general and administrative expenses | 71,005 | 77,952 |  | 72,061 |
Impairment of goodwill and other intangible assets | 105,972 | 0 |  | 0 |
(Gain) loss on sale of property, plant and equipment | (2,644) | 161 |  | (10) |
Restructuring charges | 2,087 | 2,114 |  | 1,832 |
(Loss) income from operations | (76,512) | 28,600 | [1] | 13,472 | [1]
Interest expense | (6,662) | (7,588) |  | (3,978) |
Interest income and other, net | 622 | 4,720 |  | 276 |
(Loss) earnings before (benefit) provision for income taxes | (82,552) | 25,732 |  | 9,770 |
(Benefit) provision for income taxes | (17,718) | 6,535 |  | 1,167 |
Net (loss) earnings available to common shareholders | (64,834) | 19,197 |  | 8,603 |
Class A [Member] |  |  |  |  |
Net (loss) earnings available to common shareholders | $ (11,408) | $ 3,331 |  | $ 1,492 |
Net (loss) earnings per common share: |  |  |  |  |
Common shares - basic and diluted (in dollars per share) | $ (5.25) | $ 1.53 |  | $ 0.69 |
Weighted-average shares outstanding: |  |  |  |  |
Common shares - basic and diluted (in shares) | 2,175 | 2,175 |  | 2,175 |
Dividends paid per common share: |  |  |  |  |
Common shares (in dollars per share) | $ 0.24 | $ 0.24 |  | $ 0.24 |
Class B [Member] |  |  |  |  |
Net (loss) earnings available to common shareholders | $ (53,426) | $ 15,866 |  | $ 7,111 |
Net (loss) earnings per common share: |  |  |  |  |
Common shares - basic and diluted (in dollars per share) | $ (5.48) | $ 1.64 |  | $ 0.75 |
Weighted-average shares outstanding: |  |  |  |  |
Common shares - basic and diluted (in shares) | 9,749 | 9,698 |  | 9,491 |
Dividends paid per common share: |  |  |  |  |
Common shares (in dollars per share) | $ 0.28 | $ 0.28 |  | $ 0.28 |
[1] | (Revised)

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