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Earnings per Common Share | 9 Months Ended
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Sep. 30, 2022
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. For the three and nine months ended September 30, 2022, we used the if-converted method for calculating the potential dilutive effect of the conversion feature of the principal amount of the 2023 Convertible Notes on earnings per common share, as required by the adoption of ASU 2020-06. Prior to the adoption of ASU 2020-06, we used the treasury stock method for calculating the potential dilutive effect of the conversion feature of the principal amount of the 2023 Convertible Notes on earnings per common share because we had the ability and intent to settle the principal amount of the outstanding 2023 Convertible Notes in cash. The conversion feature had a dilutive impact on earnings per common share for the three and nine months ended September 30, 2022 and 2021, 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 September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Numerator — basic and diluted |  |  |  |  |  |  |
Net income | $ | 77,267 |  |  | $ | 69,480 |  |  | $ | 188,016 |  |  | $ | 196,758 |
Denominator |  |  |  |  |  |  |
Weighted average number of common shares outstanding — basic | 33,812 |  |  | 33,495 |  |  | 33,741 |  |  | 33,478 |
Effect of dilutive share-based awards | 545 |  |  | 662 |  |  | 607 |  |  | 697 |
Effect of dilutive stock options | 322 |  |  | 363 |  |  | 330 |  |  | 369 |
Effect of dilutive convertible notes | 1,239 |  |  | 842 |  |  | 1,147 |  |  | 721 |
Weighted average number of common shares outstanding — diluted | 35,918 |  |  | 35,362 |  |  | 35,825 |  |  | 35,265 |
Earnings per common share — basic | $ | 2.29 |  |  | $ | 2.07 |  |  | $ | 5.57 |  |  | $ | 5.88 |
Earnings per common share — diluted | $ | 2.15 |  |  | $ | 1.96 |  |  | $ | 5.25 |  |  | $ | 5.58 |
Antidilutive stock options and share-based awards | — |  |  | 2 |  |  | 10 |  |  | 5 |

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