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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Income Statement [Abstract]    
Revenues $ 410,320 $ 315,316
Cost of revenues (354,181) (270,284)
Gross profit 56,139 45,032
General and administrative expense (23,072) (17,099)
Intangible asset amortization (3,568) (2,866)
Acquisition related costs (255) 0
Other operating expense, net (975) (2,312)
Operating income 28,269 22,755
Interest income 10 14
Interest expense (4,587) (6,004)
Gain (loss) on extinguishment of debt, net 2,428 (337)
Income before income taxes 26,120 16,428
Income tax expense (6,597) (4,760)
Net income 19,523 11,668
Less: Net income attributable to noncontrolling interests (271) (1,113)
Net income attributable to Sterling common stockholders $ 19,252 $ 10,555
Net income per share attributable to Sterling common stockholders:    
Basic (in dollars per share) $ 0.64 $ 0.37
Diluted (in dollars per share) $ 0.64 $ 0.37
Weighted average common shares outstanding:    
Basic (in shares) 29,964 28,279
Diluted (in shares) 30,112 28,763