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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2021
Earnings Per Common Share [Abstract] |
Schedule Of Net Income (Loss) Per Common Share |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
(Dollars in thousands, except per share amounts) | 2021 |  | 2020 |  | 2021 |  | 2020
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income (loss) | $ | 679,982 |  |  | $ | 190,880 |  |  | $ | 1,021,844 |  |  | $ | 207,492 |
| Less: dividends declared-common shares and unvested common shares |  | (62,045) |  |  |  | (61,927) |  |  |  | (124,274) |  |  |  | (125,205) |
| Undistributed earnings |  | 617,937 |  |  |  | 128,953 |  |  |  | 897,570 |  |  |  | 82,287 |
| Percentage allocated to common shareholders (1) |  | 98.6 | % |  |  | 98.7 | % |  |  | 98.7 | % |  |  | 98.7 | %
|  |  | 609,411 |  |  |  | 127,233 |  |  |  | 885,595 |  |  |  | 81,224 |
| Add: dividends declared-common shareholders |  | 61,245 |  |  |  | 61,148 |  |  |  | 122,659 |  |  |  | 123,637 |
| Numerator for basic and diluted earnings per common share | $ | 670,656 |  |  | $ | 188,381 |  |  | $ | 1,008,254 |  |  | $ | 204,861 |
| Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Denominator for basic earnings per weighted-average common shares |  | 39,527 |  |  |  | 39,449 |  |  |  | 39,535 |  |  |  | 39,827 |
| Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Options |  | 41 |  |  |  | 69 |  |  |  | 48 |  |  |  | 81 |
| Denominator for diluted earnings per adjusted weighted-average common shares |  | 39,567 |  |  |  | 39,519 |  |  |  | 39,582 |  |  |  | 39,908 |
| Per common share net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Basic | $ | 16.97 |  |  | $ | 4.78 |  |  | $ | 25.50 |  |  | $ | 5.14 |
| Diluted | $ | 16.95 |  |  | $ | 4.77 |  |  | $ | 25.47 |  |  | $ | 5.13 |
(1) | Basic weighted-average common shares outstanding |  | 39,527 |  |  |  | 39,449 |  |  |  | 39,535 |  |  |  | 39,827 |
| Basic weighted-average common shares outstanding and unvested common shares expected to vest |  | 40,080 |  |  |  | 39,983 |  |  |  | 40,069 |  |  |  | 40,348 |
| Percentage allocated to common shareholders |  | 98.6 | % |  |  | 98.7 | % |  |  | 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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