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WEIGHTED AVERAGE SHARE COUNTS (Tables) | 6 Months Ended
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Jun. 30, 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):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares used in basic earnings per share calculation | ​ | 46,840 |  | 46,619 |  | 46,792 |  | 46,559
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock units | ​ | 569 |  | 242 |  | 596 |  | 279
Performance-based restricted stock units | ​ | — |  | — |  | — |  | —
Total effects of dilutive securities | ​ | 569 |  | 242 |  | 596 |  | 279
Shares used in dilutive earnings per share calculation | ​ | 47,409 |  | 46,861 |  | 47,388 |  | 46,838

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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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