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Earnings (Loss) Per Common Share (EPS) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share, Basic and Diluted [Abstract] |
Earnings (Loss) Per Common Share (EPS) | 11. Earnings (Loss) Per Common Share (EPS). The computation of weighted average shares outstanding and the basic and diluted earnings (loss) per common share for the three and nine-month periods ended September 30, 2021 and 2020 consisted of the following (in thousands, except per share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
Net income (loss) | ​ | $ | 11,967 | ​ | $ | (3,009) | ​ | $ | 27,841 | ​ | $ | (25,221)
Average common shares outstanding | ​ |  | 56,302 | ​ |  | 55,505 | ​ |  | 56,033 | ​ |  | 55,386
Basic EPS | ​ | $ | 0.21 | ​ | $ | (0.05) | ​ | $ | 0.50 | ​ | $ | (0.46)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Average common shares outstanding | ​ | ​ | 56,302 | ​ | ​ | 55,505 | ​ | ​ | 56,033 | ​ | ​ | 55,386
Effect of dilutive stock awards | ​ | ​ | 1,247 | ​ | ​ | — | ​ | ​ | 1,241 | ​ | ​ | —
Total potential shares outstanding | ​ | ​ | 57,549 | ​ | ​ | 55,505 | ​ | ​ | 57,274 | ​ | ​ | 55,386
Diluted EPS | ​ | $ | 0.21 | ​ | $ | (0.05) | ​ | $ | 0.49 | ​ | $ | (0.46)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity awards excluded as the impact was anti-dilutive (1) | ​ | ​ | 419 | ​ | ​ | 4,044 | ​ | ​ | 815 | ​ | ​ | 4,202
(1) | Does not reflect the impact of incremental repurchases under the treasury stock method.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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