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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income attributable to Sterling common stockholders $ 20,056 $ 18,210 $ 30,611 $ 21,325
Denominator:        
Weighted average common shares outstanding - basic (in shares) 28,582 27,941 28,433 27,794
Shares for dilutive unvested stock and warrants (in shares) 472 16 445 93
Weighted average common shares outstanding - diluted (in shares) 29,054 27,957 28,878 27,887
Basic net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.70 $ 0.65 $ 1.08 $ 0.77
Diluted net income per share attributable to Sterling common stockholders (in dollars per share) $ 0.69 $ 0.65 $ 1.06 $ 0.76