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v3.10.0.1

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenues | $ 268,734 | $ 246,412 | $ 491,226 | $ 399,828
Cost of revenues | (237,269) | (221,207) | (439,240) | (365,336)
Gross profit | 31,465 | 25,205 | 51,986 | 34,492
General and administrative expenses | (13,622) | (12,812) | (26,649) | (23,416)
Other operating expense, net | (5,693) | (4,037) | (6,509) | (4,508)
Operating income | 12,150 | 8,356 | 18,828 | 6,568
Interest income | 201 | 44 | 330 | 85
Interest expense | (3,111) | (2,984) | (6,199) | (3,096)
Loss on extinguishment of debt | 0 | (755) | 0 | (755)
Income before income taxes and noncontrolling interests in earnings | 9,240 | 4,661 | 12,959 | 2,802
Income tax expense | (98) | (98) | (138) | (125)
Net income | 9,142 | 4,563 | 12,821 | 2,677
Noncontrolling interests in earnings | (966) | (901) | (2,158) | (1,272)
Net income attributable to Sterling common stockholders | $ 8,176 | $ 3,662 | $ 10,663 | $ 1,405
Net income per share attributable to Sterling common stockholders: |  |  |  |
Basic (USD per share) | $ 0.30 | $ 0.14 | $ 0.40 | $ 0.05
Diluted (USD per share) | $ 0.30 | $ 0.13 | $ 0.39 | $ 0.05
Weighted average number of common shares outstanding used in computing per share amounts: |  |  |  |
Basic (in shares) | 26,887 | 26,978 | 26,881 | 25,972
Diluted (in shares) | 27,125 | 27,336 | 27,162 | 26,409

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