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CONDENSED CONSOLIDATED INCOME STATEMENTS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Statement [Abstract] |  |
Revenues | $ 51,775 | $ 42,628
Cost of goods sold | 40,605 | 35,413
Gross profit | 11,170 | 7,215
Operating expenses: |  |
Salaries, benefits and payroll taxes | 2,710 | 2,573
Depreciation and amortization | 676 | 188
Selling, general and administrative | 2,800 | 3,101
Change in the estimated fair value of contingent consideration | (967) | 0
Total operating expenses | 5,219 | 5,862
Operating income | 5,951 | 1,353
Other income (expenses): |  |
Interest expense, net | (981) | (180)
Other income | 37 | 34
Total other income (expenses), net | (944) | (146)
Income before income tax expense | 5,007 | 1,207
Income tax expense | 974 | 232
Net income | $ 4,033 | $ 975
Net income per common share: |  |
Basic (in dollars per share) | $ 0.10 | $ 0.02
Diluted (in dollars per share) | $ 0.10 | $ 0.02
Weighted-average number of common shares: |  |
Basic (in shares) | 39,997 | 40,412
Diluted (in shares) | 39,997 | 40,441

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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