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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |  |
Revenues | $ 2,131,278 | $ 2,165,702 | $ 2,087,185
Cost of sales | (1,337,773) | (1,335,791) | (1,284,865)
Gross profit | 793,505 | 829,911 | 802,320
Selling, general and administrative expenses | (417,329) | (411,352) | (389,743)
Research and development expenses | (94,360) | (91,552) | (88,748)
Amortization of intangibles | (74,609) | (75,140) | (90,188)
Gain from patent litigation | 0 | 62,141 | 0
Operating income | 207,207 | 314,008 | 233,641
Interest expense, net | (55,814) | (60,839) | (82,651)
Non-operating pension benefit (cost) | 1,017 | (99) | (561)
Loss on debt extinguishment | 0 | (22,990) | (52,441)
Income from continuing operations before taxes | 152,410 | 230,080 | 97,988
Income tax benefit (expense) | (42,519) | (62,936) | 4,619
Income from continuing operations | 109,891 | 167,144 | 102,607
Loss from discontinued operations, net of tax | (486,667) | (6,433) | (9,754)
Net income (loss) | (376,776) | 160,711 | 92,853
Less: Net income (loss) attributable to noncontrolling interest | 239 | (183) | (357)
Net income (loss) attributable to Belden | (377,015) | 160,894 | 93,210
Less: Preferred stock dividends | 18,437 | 34,931 | 34,931
Net income (loss) attributable to Belden common stockholders | $ (395,452) | $ 125,963 | $ 58,279
Weighted average number of common shares and equivalents: |  |  |
Basic (in shares) | 42,203 | 40,675 | 42,220
Diluted (in shares) | 42,416 | 40,956 | 42,643
Basic income (loss) per share attributable to Belden common stockholders: |  |  |
Continuing operations attributable to Belden common stockholders (in dollars per share) | $ 2.16 | $ 3.25 | $ 1.61
Discontinued operations attributable to Belden common stockholders (in dollars per share) | (11.53) | (0.16) | (0.23)
Basic income (loss) per share attributable to Belden common stockholders: | (9.37) | 3.10 | 1.38
Diluted income (loss) per share attributable to Belden common stockholders: |  |  |
Continuing operations attributable to Belden common stockholders (in dollars per share) | 2.15 | 3.23 | 1.60
Discontinued operations attributable to Belden common stockholders (in dollars per share) | (11.53) | (0.16) | (0.23)
Diluted income (loss) per share attributable to Belden stockholders: | $ (9.37) | $ 3.08 | $ 1.37

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