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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Revenues $ 510,568 $ 401,666 $ 920,888 $ 716,982
Cost of revenues (442,184) (345,419) (796,365) (615,703)
Gross profit 68,384 56,247 124,523 101,279
General and administrative expense (23,424) (15,829) (46,496) (32,928)
Intangible asset amortization (3,514) (2,866) (7,082) (5,732)
Acquisition related costs (230) 0 (485) 0
Other operating expense, net (126) (4,832) (1,101) (7,144)
Operating income 41,090 32,720 69,359 55,475
Interest income 30 12 40 26
Interest expense (4,480) (5,737) (9,067) (11,741)
Gain on extinguishment of debt, net 0 1,401 2,428 1,064
Income before income taxes 36,640 28,396 62,760 44,824
Income tax expense (10,268) (8,179) (16,865) (12,939)
Net income 26,372 20,217 45,895 31,885
Less: Net income attributable to noncontrolling interests (411) (161) (682) (1,274)
Net income attributable to Sterling common stockholders $ 25,961 $ 20,056 $ 45,213 $ 30,611
Net income per share attributable to Sterling common stockholders:        
Basic (in dollars per share) $ 0.86 $ 0.70 $ 1.50 $ 1.08
Diluted (in dollars per share) $ 0.86 $ 0.69 $ 1.50 $ 1.06
Weighted average common shares outstanding:        
Basic (in shares) 30,225 28,582 30,094 28,433
Diluted (in shares) 30,362 29,054 30,229 28,878