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Loss Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Loss Per Common Share | Summarized basic and diluted earnings per common share were calculated as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands, except per share data) | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net earnings (loss) | $ | 13,753 |  |  | $ | (8,893 | ) |  | $ | (6,090 | ) |  | $ | (15,572 | )
Denominator: |  |  |  |  |  |  |
Weighted-average shares outstanding | 53,450 |  |  | 53,292 |  |  | 53,428 |  |  | 53,255 |
Effect of dilutive stock awards(1) | 845 |  |  | — |  |  | — |  |  | — |
Weighted-average dilutive shares | 54,295 |  |  | 53,292 |  |  | 53,428 |  |  | 53,255 |
Basic earnings (loss) per common share | $ | 0.26 |  |  | $ | (0.17 | ) |  | $ | (0.11 | ) |  | $ | (0.29 | )
Diluted earnings (loss) per common share | $ | 0.25 |  |  | $ | (0.17 | ) |  | $ | (0.11 | ) |  | $ | (0.29 | )
Anti-dilutive securities excluded from diluted loss per common share: |  |  |  |  |  |  |
Anti-dilutive restricted share units | — |  |  | 688 |  |  | 797 |  |  | 688 |
Anti-dilutive performance share units | 222 |  |  | 880 |  |  | 1,172 |  |  | 880 |
Anti-dilutive stock options | 2,411 |  |  | 3,251 |  |  | 2,801 |  |  | 3,251 |
(1) | There was no dilutive effect to the loss per common share for the six months ended June 30, 2018 and the three and six months ended June 30, 2017 due to the net loss incurred for respective periods.

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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/2003/role/presentationRef -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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