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Loss Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Loss Per Common Share | Summarized basic and diluted earnings per common share were calculated as follows:
| Three Months Ended March 31,
(in thousands, except per share data) | 2018 |  | 2017
Numerator: |  |  |
Net loss | $ | (19,843 | ) |  | $ | (6,679 | )
Denominator: |  |  |
Weighted-average shares outstanding | 53,406 |  |  | 53,217 |
Effect of dilutive stock awards(1) | — |  |  | — |
Weighted-average dilutive shares | 53,406 |  |  | 53,217 |
Basic loss per common share | $ | (0.37 | ) |  | $ | (0.13 | )
Diluted loss per common share | $ | (0.37 | ) |  | $ | (0.13 | )
Anti-dilutive securities excluded from diluted loss per common share: |  |  |
Anti-dilutive restricted share units | 874 |  |  | 731 |
Anti-dilutive performance share units | 1,294 |  |  | 888 |
Anti-dilutive stock options | 3,033 |  |  | 3,330 |
(1) | There was no dilutive effect to the loss per common share for the three months ended March 31, 2018 and 2017 due to the net loss incurred for both 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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