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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenues $ 1,126,278 $ 1,037,667 $ 957,958
Cost of revenues (1,018,484) (927,335) (868,866)
Gross profit 107,794 110,332 89,092
General and administrative expense (49,200) (48,220) (46,552)
Intangible asset amortization (4,695) (2,400) (1,799)
Acquisition related costs (4,311) 0 0
Other operating expense, net (11,837) (17,101) (14,565)
Operating income 37,751 42,611 26,176
Interest income 1,142 1,017 314
Interest expense (16,686) (12,350) (9,800)
Loss on extinguishment of debt (7,728) 0 (755)
Income before income taxes 14,479 31,278 15,935
Income tax benefit (expense) 26,216 (1,738) (118)
Net income 40,695 29,540 15,817
Less: Net income attributable to noncontrolling interests (794) (4,353) (4,200)
Net income attributable to Sterling common stockholders $ 39,901 $ 25,187 $ 11,617
Net income (loss) per share attributable to Sterling common stockholders:      
Basic (in dollars per share) $ 1.50 $ 0.94 $ 0.44
Diluted (in dollars per share) $ 1.47 $ 0.93 $ 0.43
Weighted average number of common shares outstanding used in computing per share amounts:      
Basic (in shares) 26,671 26,903 26,274
Diluted (in shares) 27,119 27,194 26,712