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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2019
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) | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Net income (loss) | $ | 342,855 |  |  | $ | 69,895 |  |  | $ | 691,755 |  |  | $ | 280,213 |
| Less: dividends declared-common shares and nonvested common shares |  | (56,999) |  |  |  | (53,240) |  |  |  | (114,136) |  |  |  | (106,480) |
| Undistributed earnings |  | 285,856 |  |  |  | 16,655 |  |  |  | 577,619 |  |  |  | 173,733 |
| Percentage allocated to common shareholders (1) |  | 98.9 | % |  |  | 98.9 | % |  |  | 98.9 | % |  |  | 98.9 | %
|  |  | 282,624 |  |  |  | 16,477 |  |  |  | 571,326 |  |  |  | 171,881 |
| Add: dividends declared-common shareholders |  | 56,394 |  |  |  | 52,705 |  |  |  | 112,925 |  |  |  | 105,403 |
| Numerator for basic and diluted earnings per common share | $ | 339,018 |  |  | $ | 69,183 |  |  | $ | 684,251 |  |  | $ | 277,284 |
| Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Denominator for basic earnings per weighted-average common shares |  | 40,277 |  |  |  | 40,504 |  |  |  | 40,291 |  |  |  | 40,487 |
| Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Options |  | 126 |  |  |  | 206 |  |  |  | 134 |  |  |  | 213 |
| Denominator for diluted earnings per adjusted weighted-average common shares |  | 40,404 |  |  |  | 40,710 |  |  |  | 40,425 |  |  |  | 40,699 |
| Per common share net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Basic | $ | 8.42 |  |  | $ | 1.71 |  |  | $ | 16.98 |  |  | $ | 6.85 |
| Diluted | $ | 8.39 |  |  | $ | 1.70 |  |  | $ | 16.93 |  |  | $ | 6.81 |
(1) | Basic weighted-average common shares outstanding |  | 40,277 |  |  |  | 40,504 |  |  |  | 40,291 |  |  |  | 40,487 |
| Basic weighted-average common shares outstanding and nonvested common shares expected to vest |  | 40,738 |  |  |  | 40,943 |  |  |  | 40,735 |  |  |  | 40,923 |
| Percentage allocated to common shareholders |  | 98.9 | % |  |  | 98.9 | % |  |  | 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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