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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents the calculation of net earnings per common share (“EPS”) — basic and diluted (in thousands, except per share data):
| Three months ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net (loss) income | $ | (37,060 | ) |  | $ | 16,606 |  |  | $ | 18,803 |  |  | $ | 34,766 |
Weighted-average number of common shares outstanding (for basic calculation) | 19,821 |  |  | 16,091 |  |  | 19,153 |  |  | 16,070 |
Dilutive securities | — |  |  | 909 |  |  | 1,159 |  |  | 894 |
Weighted-average common and common equivalent shares outstanding (for diluted calculation) | 19,821 |  |  | 17,000 |  |  | 20,312 |  |  | 16,964 |
EPS — basic | $ | (1.87 | ) |  | $ | 1.03 |  |  | $ | 0.98 |  |  | $ | 2.16 |
EPS — diluted | $ | (1.87 | ) |  | $ | 0.98 |  |  | $ | 0.93 |  |  | $ | 2.05 |

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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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