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Income Per Share | 6 Months Ended
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Jun. 30, 2020
Income Per Share |
Net Income Per Share | ​ 10. 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,
​ | ​ | 2020 | ​ | 2019 |  | 2020 | ​ | 2019
Net income (in thousands) - basic and diluted | ​ | $ | 55,496 | ​ | $ | 52,051 | ​ | $ | 106,268 | ​ | $ | 90,035
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - basic | ​ | ​ | 32,867,842 | ​ | ​ | 33,976,169 | ​ | ​ | 33,018,148 | ​ | ​ | 34,072,314
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Dilutive effect of common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | 47,618 | ​ | ​ | 84,952 | ​ | ​ | 59,419 | ​ | ​ | 88,516
RSAs with market-based conditions | ​ | ​ | 146,496 | ​ | ​ | 174,840 | ​ | ​ | 138,760 | ​ | ​ | 177,436
RSAs with performance-based conditions | ​ | ​ | 17,314 | ​ | ​ | 71,246 | ​ | ​ | 33,546 | ​ | ​ | 53,618
Stock options | ​ | ​ | 123,153 | ​ | ​ | 250,457 | ​ | ​ | 151,262 | ​ | ​ | 238,164
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - diluted | ​ | ​ | 33,202,423 | ​ | ​ | 34,557,664 | ​ | ​ | 33,401,135 | ​ | ​ | 34,630,048
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income per common share | ​ | $ | 1.69 | ​ | $ | 1.53 | ​ | $ | 3.22 | ​ | $ | 2.64
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per common share | ​ | $ | 1.67 | ​ | $ | 1.51 | ​ | $ | 3.18 | ​ | $ | 2.60
​ 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,
​ | ​ | 2020 |  | 2019 |  | 2020 |  | 2019
Anti-dilutive common stock equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSAs with service-based conditions | ​ | ​ | 7,281 | ​ | ​ | 1,087 | ​ | ​ | 6,276 | ​ | ​ | 7,897
RSAs with market-based conditions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,171 | ​ | ​ | 9,851
RSAs with performance-based conditions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Stock options | ​ | ​ | 61,370 | ​ | ​ | 81,411 | ​ | ​ | 46,718 | ​ | ​ | 102,550
Total anti-dilutive common stock equivalents | ​ | ​ | 68,651 | ​ | ​ | 82,498 | ​ | ​ | 57,165 | ​ | ​ | 120,298
​

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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