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Net Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Net Income Per Common Share [Table Text Block] | The following table sets forth the computation of basic and diluted net income per common share:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (thousands, except per-share data)
Net income | $ | 41,825 |  |  | $ | 22,154 |  |  | $ | 78,875 |  |  | $ | 32,174 |
Weighted average common shares outstanding during the period (for basic calculation) | 38,981 |  |  | 38,643 |  |  | 38,880 |  |  | 38,572 |
Dilutive effect of other potential common shares | 422 |  |  | 359 |  |  | 504 |  |  | 359 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,403 |  |  | 39,002 |  |  | 39,384 |  |  | 38,931 |
Net income per common share - Basic | $ | 1.07 |  |  | $ | 0.57 |  |  | $ | 2.03 |  |  | $ | 0.83 |
Net income per common share - Diluted | $ | 1.06 |  |  | $ | 0.57 |  |  | $ | 2.00 |  |  | $ | 0.83 |

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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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