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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity |
Reconciliation of number of shares outstanding with the number of shares used in computing basic and diluted earnings per share | The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, | ​
​ |  |  | 2019 |  | 2018 |  | 2017 |
Common shares outstanding, end of period | ​ |  | 36,658 |  | 36,894 |  | 37,187 | ​
Effect of using weighted average common shares outstanding | ​ |  | 196 |  | 308 |  | 52 | ​
Shares used in computing earnings per share—basic | ​ |  | 36,854 |  | 37,202 |  | 37,239 | ​
Effect of shares issuable under stock option plans based on the treasury stock method | ​ |  | 204 |  | 283 |  | 316 | ​
Effect of restricted and contingently issuable shares | ​ |  | 73 |  | 107 |  | 117 | ​
Shares used in computing earnings per share—diluted | ​ |  | 37,131 |  | 37,592 |  | 37,672 | ​

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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