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Earnings Per Common Share
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Common Share
Note 13—Earnings Per Common Share

Basic and diluted earnings per common share are computed by dividing net income by the weighted-average number of basic and diluted common shares outstanding, respectively. The weighted-average number of diluted common shares includes the impact of dilutive securities, including outstanding stock options, restricted stock units, and performance stock units. The table below reconciles the weighted-average basic and diluted common shares outstanding:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
Numerator for basic and diluted earnings per share:
Net income$9,540 $27,644 $43,758 $70,935 
Denominator:
Weighted average number of common shares outstanding - basic74,943 74,700 74,983 74,684 
Effect of dilutive securities 1
133 77 187 84 
Weighted average number of common shares outstanding - diluted75,076 74,777 75,170 74,768 
Basic earnings per share:$0.13 $0.37 $0.58 $0.95 
Diluted earnings per share:$0.13 $0.37 $0.58 $0.95 
1.Certain outstanding equity awards are anti-dilutive and therefore excluded from the calculation of the weighted average number of diluted common shares outstanding.

Anti-dilutive outstanding equity awards under share-based compensation plans were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
Anti-dilutive 2,184 2,244 1,788 2,145