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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 315,316 $ 296,688
Cost of revenues (270,284) (261,443)
Gross profit 45,032 35,245
General and administrative expense (17,099) (17,604)
Intangible asset amortization (2,866) (2,837)
Acquisition related costs 0 (473)
Other operating expense, net (2,312) (2,228)
Operating income 22,755 12,103
Interest income 14 99
Interest expense (6,004) (7,803)
Loss on extinguishment of debt (337) 0
Income before income taxes 16,428 4,399
Income tax expense (4,760) (1,184)
Net income 11,668 3,215
Less: Net income attributable to noncontrolling interests (1,113) (100)
Net income attributable to Sterling common stockholders $ 10,555 $ 3,115
Net income per share attributable to Sterling common stockholders:    
Basic (in dollars per share) $ 0.37 $ 0.11
Diluted (in dollars per share) $ 0.37 $ 0.11
Weighted average common shares outstanding:    
Basic (in shares) 28,279 27,736
Diluted (in shares) 28,763 27,992