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Net Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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
| 2015 |  | 2014 |  | 2013
| (thousands, except per-share data)
Net income | $ | 52,182 |  |  | $ | 80,009 |  |  | $ | 116,936 |
Weighted average common shares outstanding during the period (for basic calculation) | 39,239 |  |  | 39,412 |  |  | 40,203 |
Dilutive effect of other potential common shares | 116 |  |  | 80 |  |  | 23 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,355 |  |  | 39,492 |  |  | 40,226 |
Net income per common share - Basic | $ | 1.33 |  |  | $ | 2.03 |  |  | $ | 2.91 |
Net income per common share - Diluted | $ | 1.33 |  |  | $ | 2.03 |  |  | $ | 2.91 |

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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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