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WEIGHTED AVERAGE SHARE COUNTS (Tables) | 12 Months Ended
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Dec. 31, 2021
Weighted Average Share Counts |
Schedule of Diluted Shares Calculation | The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, |
​ |  |  | 2021 |  | 2020 |  | 2019 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares used in basic earnings per share calculation | ​ |  | 46,890 |  | 46,647 |  | 46,373 | ​
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock units | ​ |  | 468 |  | 318 |  | 349 | ​
Performance-based restricted stock units | ​ |  | 28 |  | 28 |  | 36 | ​
Total effects of dilutive securities | ​ |  | 496 |  | 346 |  | 385 | ​
Shares used in dilutive earnings per share calculation | ​ |  | 47,386 |  | 46,993 |  | 46,758 | ​

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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=124432515&loc=d3e3550-109257 + Details
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