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Net Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2022
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
| 2022 |  | 2021 |  | 2022 |  | 2021
| (thousands, except per-share data)
Net income | $ | 218,111 |  |  | $ | 302,556 |  |  | $ | 520,711 |  |  | $ | 451,712 |
Weighted average common shares outstanding during the period (for basic calculation) | 39,544 |  |  | 39,442 |  |  | 39,509 |  |  | 39,399 |
Dilutive effect of other potential common shares | 219 |  |  | 246 |  |  | 253 |  |  | 234 |
Weighted average common shares and potential common shares (for diluted calculation) | 39,763 |  |  | 39,688 |  |  | 39,762 |  |  | 39,633 |
Net income per common share - Basic | $ | 5.52 |  |  | $ | 7.67 |  |  | $ | 13.18 |  |  | $ | 11.47 |
Net income per common share - Diluted | $ | 5.49 |  |  | $ | 7.62 |  |  | $ | 13.10 |  |  | $ | 11.40 |

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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=124432515&loc=d3e3550-109257 + Details
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