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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings per share calculation [Table Text Block] | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands, except per share amounts) |  | 2020 |  | 2019 |  | 2018
Basic earnings per share: |  | ​ |  |  | ​ |  |  | ​ |
Net income | ​ | $ | 71,176 | ​ | $ | 193,468 | ​ | $ | 69,984
Weighted-average common shares | ​ |  | 59,657 | ​ |  | 58,534 | ​ |  | 58,912
Basic earnings per share | ​ | $ | 1.19 | ​ | $ | 3.31 | ​ | $ | 1.19
Diluted earnings per share: (1) | ​ |  |  | ​ |  |  | ​ |  |
Net income | ​ | $ | 71,176 | ​ | $ | 193,468 | ​ | $ | 69,984
Weighted-average common shares | ​ |  | 59,657 | ​ |  | 58,534 | ​ |  | 58,912
Effect of dilutive awards: | ​ |  |  | ​ |  |  | ​ |  |
Employee stock plans | ​ |  | 1,188 | ​ |  | 1,098 | ​ |  | 1,382
Diluted weighted-average common shares | ​ |  | 60,845 | ​ |  | 59,632 | ​ |  | 60,294
Diluted earnings per share | ​ | $ | 1.17 | ​ | $ | 3.24 | ​ | $ | 1.16
(1) | The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has included in the 2020, 2019 and 2018 calculations those shares that were contingently issuable upon the satisfaction of the performance conditions as of the end of the respective periods.

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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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