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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenues: |  |  |  |
Revenues from products and services | $ 73,182 | $ 84,229 | $ 219,829 | $ 254,484
Leasing | 9,815 | 7,066 | 25,204 | 23,255
Total revenues | 82,997 | 91,295 | 245,033 | 277,739
Cost of sales: |  |  |  |
Total cost of sales | 62,834 | 67,211 | 181,159 | 205,552
Selling, general and administrative | 25,265 | 20,843 | 84,416 | 68,832
Engineering and product development | 3,510 | 3,983 | 11,270 | 14,882
Impairments |  |  |  | 7,719
Restructuring and other charges |  | 602 | 26,020 | 34,902
(Gain) loss on sale of assets | (13) | 14 | (3,886) | (538)
Foreign currency transaction (gains) and losses | (1,663) | 746 | (764) | (1,679)
Total costs and expenses | 89,933 | 93,399 | 298,215 | 329,670
Operating loss | (6,936) | (2,104) | (53,182) | (51,931)
Interest income | 188 | 188 | 300 | 2,047
Interest expense | (94) | (138) | (592) | (538)
Loss before income taxes | (6,842) | (2,054) | (53,474) | (50,422)
Income tax provision (benefit) | 4,301 | (16,380) | 11,094 | (30,908)
Net income (loss) | $ (11,143) | $ 14,326 | $ (64,568) | $ (19,514)
Income (loss) per common share: |  |  |  |
Basic (in dollars per share) | $ (0.31) | $ 0.41 | $ (1.82) | $ (0.55)
Diluted (in dollars per share) | $ (0.31) | $ 0.41 | $ (1.82) | $ (0.55)
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 35,387 | 35,049 | 35,386 | 35,255
Diluted (in shares) | 35,387 | 35,249 | 35,386 | 35,255
Products |  |  |  |
Revenues: |  |  |  |
Revenues from products and services | $ 53,622 | $ 66,451 | $ 165,066 | $ 197,142
Cost of sales: |  |  |  |
Total cost of sales | 48,120 | 50,550 | 133,243 | 153,926
Services |  |  |  |
Revenues: |  |  |  |
Revenues from products and services | 19,560 | 17,778 | 54,763 | 57,342
Cost of sales: |  |  |  |
Total cost of sales | 7,020 | 9,125 | 24,687 | 28,035
Leasing |  |  |  |
Cost of sales: |  |  |  |
Total cost of sales | $ 7,694 | $ 7,536 | $ 23,229 | $ 23,591

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