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Net Income Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2020
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
| 2020 |  | 2019 |  | 2020 |  | 2019
| (thousands, except per-share data)
Net income | $ | 103,192 |  |  | $ | 27,171 |  |  | $ | 148,978 |  |  | $ | 66,278 |
Weighted average common shares outstanding during the period (for basic calculation) | 39,315 |  |  | 39,087 |  |  | 39,264 |  |  | 39,020 |
Dilutive effect of other potential common shares | 211 |  |  | 205 |  |  | 132 |  |  | 182 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,526 |  |  | 39,292 |  |  | 39,396 |  |  | 39,202 |
Net income per common share - Basic | $ | 2.62 |  |  | $ | 0.70 |  |  | $ | 3.79 |  |  | $ | 1.70 |
Net income per common share - Diluted | $ | 2.61 |  |  | $ | 0.69 |  |  | $ | 3.78 |  |  | $ | 1.69 |

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- References No definition available. + Details
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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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