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Net Income Per Share | 6 Months Ended
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Jun. 30, 2023
Net Income Per Share |
Net Income Per Share | ​ 9. NET INCOME PER SHAR E ​ Basic net income per share is calculated by dividing net income by the number of weighted average shares outstanding during the period, without consideration for common stock equivalents. ​ Diluted net income per share is calculated by adjusting the number of weighted average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury stock method. ​ Basic and diluted net income per share were computed as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
​ | ​ | 2023 | ​ | 2022 |  | 2023 | ​ | 2022
Net income (in thousands) | ​ | $ | 164,400 | ​ | $ | 143,697 | ​ | $ | 300,270 | ​ | $ | 258,410
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - basic | ​ | ​ | 31,599,744 | ​ | ​ | 32,405,292 | ​ | ​ | 31,575,337 | ​ | ​ | 32,570,988
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Dilutive effect of common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | 25,052 | ​ | ​ | 12,123 | ​ | ​ | 23,848 | ​ | ​ | 13,625
RSAs with market-based conditions | ​ | ​ | 20,039 | ​ | ​ | 52,871 | ​ | ​ | 22,450 | ​ | ​ | 76,515
RSAs with performance-based conditions | ​ | ​ | 1,974 | ​ | ​ | 39,677 | ​ | ​ | 15,503 | ​ | ​ | 51,851
Stock options | ​ | ​ | 84,998 | ​ | ​ | 104,486 | ​ | ​ | 85,522 | ​ | ​ | 114,570
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - diluted | ​ | ​ | 31,731,807 | ​ | ​ | 32,614,449 | ​ | ​ | 31,722,660 | ​ | ​ | 32,827,549
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income per common share | ​ | $ | 5.20 | ​ | $ | 4.43 | ​ | $ | 9.51 | ​ | $ | 7.93
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per common share | ​ | $ | 5.18 | ​ | $ | 4.41 | ​ | $ | 9.47 | ​ | $ | 7.87
​ The following table summarizes shares excluded from the calculation of diluted net income per share because their effect would have been anti-dilutive: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, |  | Six Months Ended June 30,
​ | ​ | 2023 |  | 2022 |  | 2023 |  | 2022
Anti-dilutive common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | - | ​ | ​ | 18,880 | ​ | ​ | 5,582 | ​ | ​ | 14,562
RSAs with market-based conditions | ​ | ​ | - | ​ | ​ | 82 | ​ | ​ | 4,467 | ​ | ​ | 232
RSAs with performance-based conditions | ​ | ​ | - | ​ | ​ | - | ​ | ​ | - | ​ | ​ | 3,954
Stock options | ​ | ​ | 14,801 | ​ | ​ | 22,875 | ​ | ​ | 18,541 | ​ | ​ | 19,731
Total anti-dilutive common stock equivalents | ​ | ​ | 14,801 | ​ | ​ | 41,837 | ​ | ​ | 28,590 | ​ | ​ | 38,479
​

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