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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income attributable to Sterling common stockholders $ 15,157 $ 7,957 $ 36,482 $ 17,600
Denominator:        
Weighted average common shares outstanding - basic (in shares) 28,003 26,365 27,832 26,359
Shares for dilutive unvested stock and warrants (in shares) 230 272 154 302
Weighted average common shares outstanding - diluted (in shares) 28,233 26,637 27,986 26,661
Basic net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.54 $ 0.30 $ 1.31 $ 0.67
Diluted net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.54 $ 0.30 $ 1.30 $ 0.66