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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2023
Net Income Per Share |
Schedule of basic and diluted income per share | ​
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 September 30, |  | Nine Months Ended September 30,
​ | ​ | 2023 | ​ | 2022 |  | 2023 | ​ | 2022
Net income (in thousands) | ​ | $ | 167,602 | ​ | $ | 153,746 | ​ | $ | 467,870 | ​ | $ | 412,156
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - basic | ​ | ​ | 31,615,110 | ​ | ​ | 32,076,285 | ​ | ​ | 31,588,740 | ​ | ​ | 32,404,275
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Dilutive effect of common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | 36,425 | ​ | ​ | 17,175 | ​ | ​ | 28,040 | ​ | ​ | 14,808
RSAs with market-based conditions | ​ | ​ | 31,918 | ​ | ​ | 44,001 | ​ | ​ | 25,606 | ​ | ​ | 65,677
RSAs with performance-based conditions | ​ | ​ | 17,663 | ​ | ​ | 40,995 | ​ | ​ | 16,223 | ​ | ​ | 48,232
Stock options | ​ | ​ | 87,696 | ​ | ​ | 101,364 | ​ | ​ | 86,247 | ​ | ​ | 110,169
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - diluted | ​ | ​ | 31,788,812 | ​ | ​ | 32,279,820 | ​ | ​ | 31,744,856 | ​ | ​ | 32,643,161
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income per common share | ​ | $ | 5.30 | ​ | $ | 4.79 | ​ | $ | 14.81 | ​ | $ | 12.72
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per common share | ​ | $ | 5.27 | ​ | $ | 4.76 | ​ | $ | 14.74 | ​ | $ | 12.63
Summary of shares excluded from the calculation of diluted income per share because their effect would have been anti-dilutive | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ | ​ | 2023 |  | 2022 |  | 2023 |  | 2022
Anti-dilutive common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | - | ​ | ​ | 15,222 | ​ | ​ | 3,721 | ​ | ​ | 14,782
RSAs with market-based conditions | ​ | ​ | - | ​ | ​ | 134 | ​ | ​ | 2,978 | ​ | ​ | 200
RSAs with performance-based conditions | ​ | ​ | - | ​ | ​ | 14,611 | ​ | ​ | - | ​ | ​ | 7,506
Stock options | ​ | ​ | - | ​ | ​ | 22,280 | ​ | ​ | 12,360 | ​ | ​ | 20,581
Total anti-dilutive common stock equivalents | ​ | ​ | - | ​ | ​ | 52,247 | ​ | ​ | 19,059 | ​ | ​ | 43,069

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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