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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income attributable to Sterling common stockholders $ 21,126 $ 15,157 $ 51,737 $ 36,482
Denominator:        
Weighted average common shares outstanding - basic (in shares) 28,710 28,003 28,527 27,832
Shares for dilutive unvested stock and warrants (in shares) 503 230 400 154
Weighted average common shares outstanding - diluted (in shares) 29,213 28,233 28,927 27,986
Basic net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.74 $ 0.54 $ 1.81 $ 1.31
Diluted net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.72 $ 0.54 $ 1.79 $ 1.30