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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net income attributable to Sterling common stockholders $ 29,523 $ 21,126 $ 74,736 $ 51,737
Denominator:        
Weighted average common shares outstanding - basic (in shares) 30,278 28,710 30,156 28,527
Shares for dilutive unvested stock and warrants (in shares) 262 503 208 400
Weighted average common shares outstanding - diluted (in shares) 30,540 29,213 30,364 28,927
Basic net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.98 $ 0.74 $ 2.48 $ 1.81
Diluted net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.97 $ 0.72 $ 2.46 $ 1.79