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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following shows a reconciliation of basic net earnings per share ("EPS") to diluted EPS:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands, except per share amounts) | 2023 |  | 2022 |  | 2023 |  | 2022
Net income available to common stockholders | $ | 107,211 |  |  | $ | 93,570 |  |  | $ | 195,164 |  |  | $ | 188,145 |
Basic weighted-average shares outstanding | 42,669 |  |  | 43,145 |  |  | 42,640 |  |  | 43,162 |
Dilutive effect of potential common stock equivalents — restricted stock units | 144 |  |  | 95 |  |  | 217 |  |  | 144 |
Diluted weighted-average shares outstanding | 42,813 |  |  | 43,240 |  |  | 42,857 |  |  | 43,306 |
Net earnings per common share: |  |  |  |  |  |  |
Basic | $ | 2.51 |  |  | $ | 2.17 |  |  | $ | 4.58 |  |  | $ | 4.36 |
Diluted | $ | 2.50 |  |  | $ | 2.16 |  |  | $ | 4.55 |  |  | $ | 4.34 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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