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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Net sales | $ 492,412 | $ 548,184
Cost of sales | 381,715 | 408,927
Gross profit | 110,697 | 139,257
Research and development costs | 26,925 | 29,487
Selling, general and administrative expenses | 76,062 | 82,600
Impairment of goodwill | 8,891 |
Restructuring expenses | 2,593 | 222
Gain on sale of property | (4,257) |
Income from operations | 483 | 26,948
Interest expense | (5,448) | (5,317)
Other (expense) income, net | (2,337) | 1,985
(Loss) earnings before provision for income taxes | (7,302) | 23,616
Provision for income taxes | 1,441 | 2,907
Net (loss) earnings available to common shareholders | (8,743) | 20,709
Common Class A [Member] |  |
Net (loss) earnings available to common shareholders | $ (1,531) | $ 3,521
Net (loss) earnings per common share: |  |
Net earnings per share, basic and diluted (in dollars per share) | $ (0.71) | $ 1.62
Weighted-average shares outstanding: |  |
Common shares - basic and diluted (in shares) | 2,167 | 2,175
Common Class B [Member] |  |
Net (loss) earnings available to common shareholders | $ (7,212) | $ 17,188
Net (loss) earnings per common share: |  |
Net earnings per share, basic and diluted (in dollars per share) | $ (0.71) | $ 1.73
Weighted-average shares outstanding: |  |
Common shares - basic and diluted (in shares) | 10,117 | 9,939

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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