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Earnings (Loss) Per Common Share (EPS) (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract] |
Schedule of Earnings (Loss) Per Share, Basic and Diluted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Net income (loss) | ​ | $ | (19,058) | ​ | $ | 6,859 | ​ | $ | (22,212) | ​ | $ | 13,054
Average common shares outstanding | ​ |  | 55,406 | ​ |  | 55,017 | ​ |  | 55,326 | ​ |  | 54,967
Basic EPS | ​ | $ | (0.34) | ​ | $ | 0.12 | ​ | $ | (0.40) | ​ | $ | 0.24
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 55,406 | ​ | ​ | 55,017 | ​ | ​ | 55,326 | ​ | ​ | 54,967
Effect of dilutive stock options (1) | ​ | ​ | — | ​ | ​ | 1,538 | ​ | ​ | — | ​ | ​ | 1,556
Total potential shares outstanding | ​ | ​ | 55,406 | ​ | ​ | 56,555 | ​ | ​ | 55,326 | ​ | ​ | 56,523
Diluted EPS | ​ | $ | (0.34) | ​ | $ | 0.12 | ​ | $ | (0.40) | ​ | $ | 0.23
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options excluded as the impact was anti-dilutive(1) | ​ | ​ | 4,224 | ​ | ​ | 1,185 | ​ | ​ | 4,282 | ​ | ​ | 1,081
(1) | For the three and six-month periods ended June 30, 2020, 2,271 and 2,256 outstanding 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 844 and 807 shares, respectively.

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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://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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