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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] |  |  |
Net sales | $ 2,319,136 | $ 2,267,278 | $ 1,767,161
Cost of sales | 2,012,754 | 1,983,627 | 1,506,286
Gross profit | 306,382 | 283,651 | 260,875
General and administrative expenses | 108,274 | 95,114 | 77,825
Selling expenses | 34,851 | 33,046 | 25,588
Amortization of intangible assets | 20,471 | 19,468 | 17,041
Acquisition expenses | 0 | 68 | 9,605
Impairment | 0 | 24,968 | 0
Income from operations | 142,786 | 110,987 | 130,816
Other income (expense): |  |  |
Interest expense | (27,340) | (28,759) | (16,400)
Other, net | 2,285 | 13,776 | 8,122
Other expense, net | (25,055) | (14,983) | (8,278)
Income before income tax | 117,731 | 96,004 | 122,538
Income tax expense | 28,156 | 26,583 | 11,116
Net income | $ 89,575 | $ 69,421 | $ 111,422
Net income per share: |  |  |
Basic (in usd per share) | $ 1.64 | $ 1.22 | $ 1.88
Diluted (in usd per share) | $ 1.62 | $ 1.19 | $ 1.78
Weighted average common shares outstanding (in thousands): |  |  |
Basic (in shares) | 54,695 | 56,996 | 59,358
Diluted (in shares) | 55,290 | 58,430 | 62,599
Dividends declared per share (in usd per share) | $ 0.320 | $ 0.305 | $ 0.255

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