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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net income | $ | 136 |  |  | $ | 18,806 |  |  | $ | 18,939 |  |  | $ | 53,572 |
Weighted-average number of common shares outstanding (for basic calculation) | 19,984 |  |  | 16,200 |  |  | 19,433 |  |  | 16,113 |
Dilutive securities | 1,122 |  |  | 1,086 |  |  | 1,170 |  |  | 987 |
Weighted-average common and common equivalent shares outstanding (for diluted calculation) | 21,106 |  |  | 17,286 |  |  | 20,603 |  |  | 17,100 |
EPS — basic | $ | 0.01 |  |  | $ | 1.16 |  |  | $ | 0.97 |  |  | $ | 3.32 |
EPS — diluted | $ | 0.01 |  |  | $ | 1.09 |  |  | $ | 0.92 |  |  | $ | 3.13 |

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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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