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Earnings per Common Share
 9 Months Ended
Sep. 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 nine months ended September 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. On August 17, 2023, we issued a total of 1,460,740 shares of our common stock to holders in connection with the conversion of their 2023 Convertible Notes at maturity. As of September 30, 2023, there were no 2023 Convertible Notes outstanding. See Note 8, “Debt” for additional information about the 2023 Convertible Notes.
 Three Months Ended September 30,Nine Months Ended September 30,
 2023202220232022
Numerator — basic and diluted    
Net income$83,317 $77,267 $193,259 $188,016 
Denominator
Weighted average number of common shares outstanding — basic
34,128 33,812 33,599 33,741 
Effect of dilutive share-based awards515 545 547 607 
Effect of dilutive stock options285 322 296 330 
Effect of dilutive convertible notes728 1,239 1,157 1,147 
Weighted average number of common shares outstanding — diluted
35,656 35,918 35,599 35,825 
Earnings per common share — basic$2.44 $2.29 $5.75 $5.57 
Earnings per common share — diluted$2.34 $2.15 $5.43 $5.25 
Antidilutive stock options and share-based awards2 — 5 10