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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues $ 246,412 $ 189,582 $ 399,828 $ 316,149
Cost of revenues (221,207) (174,039) (365,336) (297,058)
Gross profit 25,205 15,543 34,492 19,091
General and administrative expenses (12,812) (8,657) (23,416) (18,742)
Other operating income (expense), net (4,037) (3,505) (4,508) (3,434)
Operating income (loss) 8,356 3,381 6,568 (3,085)
Interest income 44 1 85 4
Interest expense (2,984) (812) (3,096) (1,685)
Loss on extinguishment of debt (755) (755)
Income (loss) before income taxes and earnings attributable to noncontrolling interests 4,661 2,570 2,802 (4,766)
Income tax expense (98) (27) (125) (27)
Net income (loss) 4,563 2,543 2,677 (4,793)
Noncontrolling owners’ interests in earnings of subsidiaries and joint ventures (901) (520) (1,272) (512)
Net income (loss) attributable to Sterling common stockholders $ 3,662 $ 2,023 $ 1,405 $ (5,305)
Net income (loss) per share attributable to Sterling common stockholders:        
Basic (in dollars per share) $ 0.14 $ 0.09 $ 0.05 $ (0.25)
Diluted (in dollars per share) $ 0.13 $ 0.09 $ 0.05 $ (0.25)
Weighted average number of common shares outstanding used in computing per share amounts:        
Basic (in shares) 26,978 22,762 25,972 21,261
Diluted (in shares) 27,336 22,959 26,409 21,261