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Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
| 2017 |  | 2016
Net income(1) | $ | 55,863 |  |  | $ | 18,160 |
Weighted-average number of common shares outstanding (for basic calculation) | 18,439 |  |  | 16,042 |
Dilutive securities(1) | 1,110 |  |  | 828 |
Weighted-average common and common equivalent shares outstanding (for diluted calculation)(1) | 19,549 |  |  | 16,870 |
EPS — basic | $ | 3.03 |  |  | $ | 1.13 |
EPS — diluted | $ | 2.86 |  |  | $ | 1.08 |
______________________________ (1) Net income, dilutive securities and weighted average common and common equivalent shares outstanding for the three months ended March 31, 2016 were adjusted from previously reported amounts due to the adoption of ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting in the second quarter of 2016 (see Note 1: Basis of Presentation).

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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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