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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenues $ 463,449 $ 383,458 $ 1,180,431 $ 1,080,184
Cost of revenues (405,645) (333,542) (1,021,348) (935,424)
Gross profit 57,804 49,916 159,083 144,760
General and administrative expense (19,637) (15,154) (52,565) (51,209)
Intangible asset amortization (2,866) (2,866) (8,598) (8,569)
Acquisition related costs 0 (401) 0 (1,013)
Other operating expense, net (3,270) (2,664) (10,414) (9,989)
Operating income 32,031 28,831 87,506 73,980
Interest income 13 23 39 146
Interest expense (3,919) (7,177) (15,660) (22,537)
Gain on extinguishment of debt, net 968 0 2,032 0
Income before income taxes 29,093 21,677 73,917 51,589
Income tax expense (7,336) (6,280) (20,275) (14,712)
Net income 21,757 15,397 53,642 36,877
Less: Net income attributable to noncontrolling interests (631) (240) (1,905) (395)
Net income attributable to Sterling common stockholders $ 21,126 $ 15,157 $ 51,737 $ 36,482
Net income per share attributable to Sterling common stockholders:        
Basic (in dollars per share) $ 0.74 $ 0.54 $ 1.81 $ 1.31
Diluted (in dollars per share) $ 0.72 $ 0.54 $ 1.79 $ 1.30
Weighted average common shares outstanding:        
Basic (in shares) 28,710 28,003 28,527 27,832
Diluted (in shares) 29,213 28,233 28,927 27,986