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Net Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2021
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
| 2021 |  | 2020 |  | 2021 |  | 2020
| (thousands, except per-share data)
Net income | $ | 302,556 |  |  | $ | 33,586 |  |  | $ | 451,712 |  |  | $ | 45,786 |
Weighted average common shares outstanding during the period (for basic calculation) | 39,442 |  |  | 39,312 |  |  | 39,399 |  |  | 39,238 |
Dilutive effect of other potential common shares | 246 |  |  | 75 |  |  | 234 |  |  | 143 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,688 |  |  | 39,387 |  |  | 39,633 |  |  | 39,381 |
Net income per common share - Basic | $ | 7.67 |  |  | $ | 0.85 |  |  | $ | 11.47 |  |  | $ | 1.17 |
Net income per common share - Diluted | $ | 7.62 |  |  | $ | 0.85 |  |  | $ | 11.40 |  |  | $ | 1.16 |

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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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