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WEIGHTED AVERAGE SHARE COUNTS | 12 Months Ended
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Dec. 31, 2021
Weighted Average Share Counts |
NET INCOME PER SHARE | (18)WEIGHTED AVERAGE SHARE COUNTS 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 | ​
​ For the years ended December 31, 2021, 2020 and 2019, restricted stock units of 124 thousand, 8 thousand, and 28 thousand, respectively, were outstanding but not included in the computation of diluted net income per share because the effect would have been anti-dilutive.

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