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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2021 and 2020 (in thousands, except per share data):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Net income |  | $ | 173,015 |  |  | $ | 86,589 |
Preferred dividends |  |  | 8,289 |  |  |  | 4,844 |
Net income available to common shareholders |  | $ | 164,726 |  |  | $ | 81,745 |
Shares for basic and diluted calculation: |  |  |  |  |  |  |  |
Average shares used in basic computation |  |  | 107,746 |  |  |  | 106,929 |
Dilutive effect of stock options and units (1) |  |  | 10,129 |  |  |  | 8,000 |
Average shares used in diluted computation |  |  | 117,875 |  |  |  | 114,929 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.53 |  |  | $ | 0.76 |
Diluted |  | $ | 1.40 |  |  | $ | 0.71 |
(1) | Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method.

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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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