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Net Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 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:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (thousands, except per-share data)
Net income | $ | 22,007 |  |  | $ | 32,285 |  |  | $ | 49,854 |  |  | $ | 64,268 |
Weighted average common shares outstanding during the period (for basic calculation) | 39,127 |  |  | 39,423 |  |  | 39,372 |  |  | 39,407 |
Dilutive effect of other potential common shares | 113 |  |  | 58 |  |  | 101 |  |  | 52 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,240 |  |  | 39,481 |  |  | 39,473 |  |  | 39,459 |
Net income per common share - Basic | $ | 0.56 |  |  | $ | 0.82 |  |  | $ | 1.27 |  |  | $ | 1.63 |
Net income per common share - Diluted | $ | 0.56 |  |  | $ | 0.82 |  |  | $ | 1.26 |  |  | $ | 1.63 |

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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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