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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Net sales | $ 733,970 | $ 690,340 | $ 2,096,978 | $ 2,083,350
Total cost of sales | 543,223 | 517,053 | 1,536,045 | 1,567,260
Gross profit | 190,747 | 173,287 | 560,933 | 516,090
Selling, general and administrative expenses | 129,268 | 112,223 | 372,481 | 338,950
Impairment of goodwill and trade names | 0 | 0 | 16,638 | 0
Operating income | 61,479 | 61,064 | 171,814 | 177,140
Other income (expenses): |  |  |  |
Interest expense | (10,454) | (9,976) | (30,566) | (29,971)
Interest income | 430 | 969 | 1,931 | 2,815
Gain on investments (unrealized) | 900 | 402 | 1,102 | 4,754
Other | 233 | 768 | 1,349 | 1,938
Total other income (expenses) | (8,891) | (7,837) | (26,184) | (20,464)
Earnings before income taxes | 52,588 | 53,227 | 145,630 | 156,676
Income tax expense (benefit): |  |  |  |
Current | 14,968 | 11,675 | 42,922 | 31,668
Deferred | (2,884) | 1,388 | (3,750) | 7,098
Total income tax expense (benefit) | 12,084 | 13,063 | 39,172 | 38,766
Earnings before equity in earnings of nonconsolidated subsidiaries | 40,504 | 40,164 | 106,458 | 117,910
Equity in loss of nonconsolidated subsidiaries | (276) | 0 | (755) | 0
Net earnings | 40,228 | 40,164 | 105,703 | 117,910
Less: earnings attributable to noncontrolling interests | (886) | (2,119) | (825) | (4,042)
Net earnings attributable to Valmont Industries, Inc. | $ 39,342 | $ 38,045 | $ 104,878 | $ 113,868
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 1.85 | $ 1.76 | $ 4.91 | $ 5.24
Diluted (in dollars per share) | $ 1.84 | $ 1.75 | $ 4.89 | $ 5.22
Product sales |  |  |  |
Net sales | $ 657,703 | $ 605,439 | $ 1,874,199 | $ 1,829,919
Total cost of sales | 494,812 | 460,549 | 1,392,595 | 1,398,775
Services sales |  |  |  |
Net sales | 76,267 | 84,901 | 222,779 | 253,431
Total cost of sales | $ 48,411 | $ 56,504 | $ 143,450 | $ 168,485

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