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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| Year Ended December 31
| 2017 |  | 2016 |  | 2015
| (thousands, except per-share data)
Net income | $ | 82,957 |  |  | $ | 38,254 |  |  | $ | 52,182 |
Weighted average common shares outstanding during the period (for basic calculation) | 38,623 |  |  | 38,761 |  |  | 39,239 |
Dilutive effect of other potential common shares | 451 |  |  | 164 |  |  | 116 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,074 |  |  | 38,925 |  |  | 39,355 |
Net income per common share - Basic | $ | 2.15 |  |  | $ | 0.99 |  |  | $ | 1.33 |
Net income per common share - Diluted | $ | 2.12 |  |  | $ | 0.98 |  |  | $ | 1.33 |

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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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