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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net income $ 10,555 $ 3,115
Denominator:    
Weighted average common shares outstanding - basic (in shares) 28,279 27,736
Shares for dilutive unvested stock and warrants (in shares) 484 256
Weighted average common shares outstanding - diluted (in shares) 28,763 27,992
Basic net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.37 $ 0.11
Diluted net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.37 $ 0.11