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Earnings per Common Share
 6 Months Ended
Jun. 30, 2023
Earnings Per Share [Abstract]  
Earnings per Common Share Earnings per Common Share
Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share adjusts basic earnings per common share for the effects of potentially dilutive common shares. Potentially dilutive common shares include the dilutive effects of shares issuable under our equity compensation plans, including stock options and share-based awards (restricted share awards, restricted stock units and performance stock units), each using the treasury stock method.
We use the if-converted method for calculating the potential dilutive effect of the conversion feature of the principal amount of our 2.0% convertible senior notes due 2023 (“2023 Convertible Notes”) on earnings per common share. The conversion feature had a dilutive impact on earnings per common share for the three and six months ended June 30, 2023 and 2022, as the average market price per share of our common stock for the periods exceeded the conversion price of $101.38 per share. See Note 8, “Debt” for additional information about the 2023 Convertible Notes.
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Numerator — basic and diluted    
Net income$62,395 $51,428 $109,942 $110,749 
Denominator
Weighted average number of common shares outstanding — basic
33,359 33,790 33,331 33,705 
Effect of dilutive share-based awards550 586 562 639 
Effect of dilutive stock options297 331 301 334 
Effect of dilutive convertible notes1,444 1,202 1,372 1,100 
Weighted average number of common shares outstanding — diluted
35,650 35,909 35,566 35,778 
Earnings per common share — basic$1.87 $1.52 $3.30 $3.29 
Earnings per common share — diluted$1.75 $1.43 $3.09 $3.10 
Antidilutive stock options and share-based awards3 23 6 15