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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Basic and diluted net income per common share Basic and diluted net income per common share calculations are as follows for the periods presented:
 
Three Months Ended
 June 30,
 20212020
Basic
Net income applicable to common stock$40,867 $20,130 
Average common shares outstanding56,325,717 56,165,452 
Net income per common share - basic$0.73 $0.36 
Diluted
Net income applicable to common stock$40,867 $20,130 
Average common shares outstanding56,325,717 56,165,452 
Effect of dilutive stock-based compensation310,181 160,024 
Average common shares outstanding - diluted56,635,898 56,325,476 
Net income per common share - diluted$0.72 $0.36 
Six Months Ended
 June 30,
 20212020
Basic
Net income applicable to common stock$98,775 $22,138 
Average common shares outstanding56,283,195 56,350,134 
Net income per common share - basic$1.75 $0.39 
Diluted
Net income applicable to common stock$98,775 $22,138 
Average common shares outstanding56,283,195 56,350,134 
Effect of dilutive stock-based compensation295,385 164,465 
Average common shares outstanding - diluted56,578,580 56,514,599 
Net income per common share - diluted$1.75 $0.39 
Schedule of antidilutive securities
Stock-based compensation awards that could potentially dilute basic net income per common share in the future that were not included in the computation of diluted net income per common share due to their anti-dilutive effect were as follows for the periods presented:
Three Months Ended
 June 30,
 20212020
Number of shares19,929264,183
Exercise prices (for stock option awards)——
Six Months Ended
 June 30,
 20212020
Number of shares19,929247,093
Exercise prices (for stock option awards)——