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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
EARNINGS PER SHARE |
Computation of basic and diluted earnings per share | The following table sets forth the computation of basic and diluted earnings per share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Numerator: |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 206,115 | ​ | $ | 293,109 | ​ | $ | 287,066
Denominator (shares in 000's): | ​ |  |  | ​ |  |  | ​ |  |
Basic weighted average shares outstanding | ​ |  | 59,633 | ​ |  | 61,960 | ​ |  | 64,886
Effect of dilutive securities - Stock options and awards | ​ |  | 615 | ​ |  | 698 | ​ |  | 796
Diluted weighted average shares outstanding | ​ |  | 60,248 | ​ |  | 62,658 | ​ |  | 65,682
Basic earnings per share | ​ | $ | 3.46 | ​ | $ | 4.73 | ​ | $ | 4.42
Diluted earnings per share | ​ | $ | 3.42 | ​ | $ | 4.68 | ​ | $ | 4.37

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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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