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Earnings (Loss) Per Common Share (EPS) (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract] |
Schedule of Earnings (Loss) Per Share, Basic and Diluted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Net income (loss) | ​ | $ | (3,009) | ​ | $ | (3,398) | ​ | $ | (25,221) | ​ | $ | 9,656
Average common shares outstanding | ​ |  | 55,505 | ​ |  | 55,152 | ​ |  | 55,386 | ​ |  | 55,029
Basic EPS | ​ | $ | (0.05) | ​ | $ | (0.06) | ​ | $ | (0.46) | ​ | $ | 0.18
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 55,505 | ​ | ​ | 55,152 | ​ | ​ | 55,386 | ​ | ​ | 55,029
Effect of dilutive stock options (1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,364
Total potential shares outstanding | ​ | ​ | 55,505 | ​ | ​ | 55,152 | ​ | ​ | 55,386 | ​ | ​ | 56,393
Diluted EPS | ​ | $ | (0.05) | ​ | $ | (0.06) | ​ | $ | (0.46) | ​ | $ | 0.17
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options excluded as the impact was anti-dilutive(1) | ​ | ​ | 4,044 | ​ | ​ | 4,299 | ​ | ​ | 4,202 | ​ | ​ | 1,361
(1) | For the three and nine-month periods ended September 30, 2020, approximately 2.2 million and 2.2 million stock options, respectively, were considered antidilutive due to the net loss in each period. Independent of the net loss incurred, the potentially dilutive effect of these options would have been approximately 951,000 and 855,000 shares, respectively. For the three-month period ended September 30, 2019, approximately 2.4 million stock options were considered antidilutive due to the net loss in the period. Independent of the net loss incurred, the potentially dilutive effect of these options would have been approximately 979,000 shares.

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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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