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EARNINGS PER SHARE (Tables) | 6 Months Ended
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Jun. 30, 2021
EARNINGS PER SHARE |
Computation of basic and diluted earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  | ​ | ​ |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 96,105 | ​ | $ | 26,996 | ​ | $ | 170,282 | ​ | $ | 82,558
Denominator (shares in 000's): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Basic weighted average shares outstanding | ​ |  | 59,464 | ​ |  | 59,354 | ​ |  | 59,553 | ​ |  | 59,769
Effect of dilutive securities - Stock options and awards | ​ |  | 700 | ​ |  | 477 | ​ |  | 676 | ​ |  | 531
Diluted weighted average shares outstanding | ​ |  | 60,164 | ​ |  | 59,831 | ​ |  | 60,229 | ​ |  | 60,300
Basic earnings per share | ​ | $ | 1.62 | ​ | $ | 0.45 | ​ | $ | 2.86 | ​ | $ | 1.38
Diluted earnings per share | ​ | $ | 1.60 | ​ | $ | 0.45 | ​ | $ | 2.83 | ​ | $ | 1.37

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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