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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
Revenues | $ 222,492 | $ 153,416
Cost of revenues | (201,898) | (144,129)
Gross profit | 20,594 | 9,287
General and administrative expenses | (13,100) | (10,604)
Other operating expense, net | (815) | (471)
Operating income (loss) | 6,679 | (1,788)
Interest income | 129 | 41
Interest expense | (3,087) | (112)
Income (loss) before income taxes and noncontrolling interests in earnings | 3,721 | (1,859)
Income tax benefit (expense) | (41) | (27)
Net income (loss) | 3,680 | (1,886)
Noncontrolling interests in earnings | (1,191) | (371)
Net income (loss) attributable to Sterling common stockholders | $ 2,489 | $ (2,257)
Net income (loss) per share attributable to Sterling common stockholders: |  |
Basic (USD per share) | $ 0.09 | $ (0.09)
Diluted (USD per share) | $ 0.09 | $ (0.09)
Weighted average number of common shares outstanding used in computing per share amounts: |  |
Basic (in shares) | 26,854 | 25,022
Diluted (in shares) | 27,078 | 25,022

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