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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Common Share [Abstract] |
Schedule Of Net Income (Loss) Per Common Share |
|  | Three Months Ended
|  | March 31,
(Dollars in thousands, except per share amounts) | 2021 |  | 2020
Net income (loss) per share: |  |  |  |  |  |  |
| Numerator |  |  |  |  |  |  |
| Net income (loss) | $ | 341,862 |  |  | $ | 16,612 |
| Less: dividends declared-common shares and unvested common shares |  | (62,229) |  |  |  | (63,277) |
| Undistributed earnings |  | 279,633 |  |  |  | (46,666) |
| Percentage allocated to common shareholders (1) |  | 98.7 | % |  |  | 98.7 | %
|  |  | 276,031 |  |  |  | (46,082) |
| Add: dividends declared-common shareholders |  | 61,415 |  |  |  | 62,488 |
| Numerator for basic and diluted earnings per common share | $ | 337,446 |  |  | $ | 16,406 |
| Denominator |  |  |  |  |  |  |
| Denominator for basic earnings per weighted-average common shares |  | 39,543 |  |  |  | 40,204 |
| Effect of dilutive securities: |  |  |  |  |  |  |
| Options |  | 54 |  |  |  | 92 |
| Denominator for diluted earnings per adjusted weighted-average common shares |  | 39,597 |  |  |  | 40,296 |
| Per common share net income (loss) |  |  |  |  |  |  |
| Basic | $ | 8.53 |  |  | $ | 0.41 |
| Diluted | $ | 8.52 |  |  | $ | 0.41 |
(1) | Basic weighted-average common shares outstanding |  | 39,543 |  |  |  | 40,204 |
| Basic weighted-average common shares outstanding and unvested common shares expected to vest |  | 40,059 |  |  |  | 40,713 |
| Percentage allocated to common shareholders |  | 98.7 | % |  |  | 98.7 | %
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |  |

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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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