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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Revenues $ 383,458 $ 291,699 $ 1,080,184 $ 779,734
Cost of revenues (333,542) (262,483) (935,424) (705,519)
Gross profit 49,916 29,216 144,760 74,215
General and administrative expense (15,154) (10,239) (51,209) (32,302)
Intangible asset amortization (2,866) (600) (8,569) (1,800)
Acquisition related costs (401) (1,896) (1,013) (2,158)
Other operating expense, net (2,664) (4,366) (9,989) (9,936)
Operating income 28,831 12,115 73,980 28,019
Interest income 23 331 146 986
Interest expense (7,177) (3,024) (22,537) (8,988)
Income before income taxes 21,677 9,422 51,589 20,017
Income tax expense (6,280) (913) (14,712) (1,782)
Net income 15,397 8,509 36,877 18,235
Less: Net income attributable to noncontrolling interests (240) (552) (395) (635)
Net income attributable to Sterling common stockholders $ 15,157 $ 7,957 $ 36,482 $ 17,600
Net income per share attributable to Sterling common stockholders:        
Basic (in dollars per share) $ 0.54 $ 0.30 $ 1.31 $ 0.67
Diluted (in dollars per share) $ 0.54 $ 0.30 $ 1.30 $ 0.66
Weighted average common shares outstanding:        
Basic (in shares) 28,003 26,365 27,832 26,359
Diluted (in shares) 28,233 26,637 27,986 26,661