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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Common Share [Abstract] |
Schedule Of Net Income (Loss) Per Common Share |
|  | Three Months Ended |  |  | Nine Months Ended
|  | September 30, |  |  | September 30,
(Dollars in thousands, except per share amounts) | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income (loss) | $ | 104,398 |  |  | $ | 198,381 |  |  | $ | 791,817 |  |  | $ | 474,354 |
| Less: dividends declared-common shares and nonvested common shares |  | (56,995) |  |  |  | (52,863) |  |  |  | (171,131) |  |  |  | (159,343) |
| Undistributed earnings |  | 47,403 |  |  |  | 145,519 |  |  |  | 620,687 |  |  |  | 315,012 |
| Percentage allocated to common shareholders (1) |  | 98.9 | % |  |  | 99.0 | % |  |  | 98.9 | % |  |  | 98.9 | %
|  |  | 46,869 |  |  |  | 144,024 |  |  |  | 613,847 |  |  |  | 311,695 |
| Add: dividends declared-common shareholders |  | 56,403 |  |  |  | 52,356 |  |  |  | 169,329 |  |  |  | 157,759 |
| Numerator for basic and diluted earnings per common share | $ | 103,273 |  |  | $ | 196,379 |  |  | $ | 783,176 |  |  | $ | 469,454 |
| Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Denominator for basic earnings per weighted-average common shares |  | 40,287 |  |  |  | 40,350 |  |  |  | 40,289 |  |  |  | 40,441 |
| Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Options |  | 125 |  |  |  | 192 |  |  |  | 131 |  |  |  | 206 |
| Denominator for diluted earnings per adjusted weighted-average common shares |  | 40,411 |  |  |  | 40,542 |  |  |  | 40,421 |  |  |  | 40,646 |
| Per common share net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Basic | $ | 2.56 |  |  | $ | 4.87 |  |  | $ | 19.44 |  |  | $ | 11.61 |
| Diluted | $ | 2.56 |  |  | $ | 4.84 |  |  | $ | 19.38 |  |  | $ | 11.55 |
(1) | Basic weighted-average common shares outstanding |  | 40,287 |  |  |  | 40,350 |  |  |  | 40,289 |  |  |  | 40,441 |
| Basic weighted-average common shares outstanding and nonvested common shares expected to vest |  | 40,746 |  |  |  | 40,769 |  |  |  | 40,738 |  |  |  | 40,871 |
| Percentage allocated to common shareholders |  | 98.9 | % |  |  | 99.0 | % |  |  | 98.9 | % |  |  | 98.9 | %
(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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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