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Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Income Per Share |
Schedule of basic and diluted income per share | ​ 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
Summary of shares excluded from the calculation of diluted income per share because their effect would have been anti-dilutive | 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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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