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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings per Share | The following table sets forth the calculation of basic and diluted earnings per share:
|  |  | Three Months Ended
|  |  | March 31,
(in thousands, except per share data) |  |  | 2018 |  |  | 2017
Net income (loss) |  | $ | (23,641) |  | $ | 8,555
Denominator for basic earnings per share - weighted-average number of |  |  |  |  |  |
| common shares outstanding during the period |  |  | 48,517 |  |  | 49,511
Incremental common shares attributable to exercise of dilutive options |  |  | — |  |  | 361
Incremental common shares attributable to outstanding restricted |  |  |  |  |  |
| stock units |  |  | — |  |  | 208
Denominator for diluted earnings per share |  |  | 48,517 |  |  | 50,080
Basic earnings (loss) per share |  |  | $(0.49) |  |  | $0.17
Diluted earnings (loss) per share |  |  | $(0.49) |  |  | $0.17

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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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