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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CONSOLIDATED STATEMENTS OF INCOME |  |  |
Revenue | $ 2,379,995 | $ 1,996,948 | $ 1,929,415
Cost of revenue | 2,101,561 | 1,795,641 | 1,709,542
Gross profit | 278,434 | 201,307 | 219,873
Selling, general and administrative expenses | 172,146 | 140,842 | 151,703
Impairment of goodwill | 0 | 2,716 | 401
Operating income | 106,288 | 57,749 | 67,769
Other income (expense): |  |  |
Investment income | 5,817 |  |
Foreign exchange gain (loss) | 253 | 202 | (763)
Other income (expense), net | 484 | (315) | 1,723
Interest income | 587 | 149 | 56
Interest expense | (8,146) | (8,914) | (7,688)
Income before provision for income taxes | 105,283 | 48,871 | 61,097
Provision for income taxes | (28,433) | (21,146) | (23,946)
Net income | 76,850 | 27,725 | 37,151
Less net income attributable to noncontrolling interests | (4,496) | (1,002) | (279)
Net income attributable to Primoris | $ 72,354 | $ 26,723 | $ 36,872
Dividends per common share (in dollars per share) | $ 0.225 | $ 0.220 | $ 0.205
Earnings per share: |  |  |
Basic (in dollars per share) | 1.41 | 0.52 | 0.71
Diluted (in dollars per share) | $ 1.40 | $ 0.51 | $ 0.71
Weighted average common shares outstanding: |  |  |
Basic (in shares) | 51,481 | 51,762 | 51,647
Diluted (in shares) | 51,741 | 51,989 | 51,798

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