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Net (Loss) Income Per Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Net (Loss) Income Per Share | 13. Net (Loss) Income Per Share Basic net (loss) income per share is computed by dividing distributed and undistributed net (loss) income allocable to common shares by the weighted-average number of common shares outstanding during the applicable period. The basic weighted-average number of common shares outstanding during the period excludes non-vested share-based payment awards. Diluted net (loss) income per share was calculated under the treasury stock method for the quarters and six months ended June 30, 2021 and June 30, 2020, which in both periods was more dilutive than the two-class method. The following table sets forth the computation of basic and diluted net (loss) income per share (in millions of dollars, except share and per share amounts):
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ | (22.4 | ) |  | $ | (6.6 | ) |  | $ | (17.9 | ) |  | $ | 22.5 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 15,835 |  |  |  | 15,781 |  |  |  | 15,820 |  |  |  | 15,809 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 120 |
Diluted |  |  | 15,835 |  |  |  | 15,781 |  |  |  | 15,820 |  |  |  | 15,929 |
Net (loss) income per common share, Basic: |  | $ | (1.42 | ) |  | $ | (0.41 | ) |  | $ | (1.13 | ) |  | $ | 1.42 |
Net (loss) income per common share, Diluted: |  | $ | (1.42 | ) |  | $ | (0.41 | ) |  | $ | (1.13 | ) |  | $ | 1.41 |
1 | Quantities in the following discussion are denoted in whole shares. For the quarter ended June 30, 2021, the quarter ended June 30, 2020 and the six months ended June 30, 2021, approximately 226,000, 71,000 and 214,000 potentially dilutive shares, respectively, were excluded from the computation of net loss per share as their effect would have been anti-dilutive. During the six months ended June 30, 2020, approximately 38,000 shares were excluded from the weighted‑average diluted shares computation as their inclusion would have been anti-dilutive.

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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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