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Earnings Per Share
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share
14.EARNINGS PER SHARE
The following table reconciles the numerators and denominators of the basic and diluted earnings per share computations for the three and nine months ended September 30, 2021 and 2020:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Numerator:
Net income attributable to Sterling common stockholders$21,126 $15,157 $51,737 $36,482 
Denominator:
Weighted average common shares outstanding — basic28,710 28,003 28,527 27,832 
Shares for dilutive unvested stock and warrants503 230 400 154 
Weighted average common shares outstanding — diluted29,213 28,233 28,927 27,986 
Basic net income per share attributable to Sterling common stockholders$0.74 $0.54 $1.81 $1.31 
Diluted net income per share attributable to Sterling common stockholders$0.72 $0.54 $1.79 $1.30