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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The following table reconciles the numerators and denominators of the basic and diluted per common share computations for net income attributable to Sterling common stockholders:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
Numerator:    
Net income attributable to Sterling common stockholders$18,210  $7,828  $21,325  $9,643  
Denominator:
Weighted average common shares outstanding — basic27,941  26,338  27,794  26,357  
Shares for dilutive unvested stock and warrants16  285  93  300  
Weighted average common shares outstanding — diluted27,957  26,623  27,887  26,657  
Basic net income per share attributable to Sterling common stockholders$0.65  $0.30  $0.77  $0.37  
Diluted net income per share attributable to Sterling common stockholders$0.65  $0.29  $0.76  $0.36