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WEIGHTED AVERAGE SHARE COUNTS | 9 Months Ended
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Sep. 30, 2021
Weighted Average Share Counts |
NET INCOME PER SHARE | (15)WEIGHTED AVERAGE SHARE COUNTS ​ The following table sets forth the computation of basic and diluted shares for the periods indicated (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares used in basic earnings per share calculation | ​ | 46,984 |  | 46,732 |  | 46,857 |  | 46,617
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock units | ​ | 364 |  | 299 |  | 515 |  | 268
Performance-based restricted stock units | ​ | — |  | — |  | — |  | —
Total effects of dilutive securities | ​ | 364 |  | 299 |  | 515 |  | 268
Shares used in dilutive earnings per share calculation | ​ | 47,348 |  | 47,031 |  | 47,372 |  | 46,885
​ For the three months ended September 30, 2021 and 2020, there were Restricted Stock Units (“RSUs”) of four thousand and zero, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive. For the nine months ended September 30, 2021 and 2020, there were RSUs of 78 thousand and 167 thousand, respectively, outstanding which were excluded from the computation of diluted net income per share because the effect would have been anti-dilutive.

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