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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary Of Significant Accounting Policies [Abstract] |
Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables |
| Years Ended December 31,
(Dollars in thousands) | 2021 |  | 2020
Reinsurance recoverable premium receivables and deductibles | $ | 46,499 |  | $ | 41,357
Net Income (Loss) Per Common Share |
|  | Years Ended December 31,
(Dollars in thousands, except per share amounts) | 2021 |  |  | 2020 |  |  | 2019 |
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ | 1,379,083 |  |  | $ | 514,151 |  |  | $ | 1,009,461 |
Less: dividends declared-common shares and nonvested common shares |  | (246,699) |  |  |  | (249,056) |  |  |  | (234,322) |
Undistributed earnings |  | 1,132,384 |  |  |  | 265,094 |  |  |  | 775,139 |
Percentage allocated to common shareholders (1) |  | 98.7 | % |  |  | 98.7 | % |  |  | 98.9 | %
|  |  | 1,117,318 |  |  |  | 261,770 |  |  |  | 766,386 |
Add: dividends declared-common shareholders |  | 243,569 |  |  |  | 246,054 |  |  |  | 231,796 |
Numerator for basic and diluted earnings per common share | $ | 1,360,887 |  |  | $ | 507,824 |  |  | $ | 998,182 |
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per weighted-average common shares |  | 39,263 |  |  |  | 39,656 |  |  |  | 40,291 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Options |  | 41 |  |  |  | 77 |  |  |  | 129 |
Denominator for diluted earnings per adjusted weighted-average common shares |  | 39,304 |  |  |  | 39,734 |  |  |  | 40,420 |
Per common share net income (loss) |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 34.66 |  |  | $ | 12.81 |  |  | $ | 24.77 |
Diluted | $ | 34.62 |  |  | $ | 12.78 |  |  | $ | 24.70 |
(1) | Basic weighted-average common shares outstanding |  | 39,263 |  |  |  | 39,656 |  |  |  | 40,291 |
| Basic weighted-average common shares outstanding and nonvested common shares expected to vest |  | 39,792 |  |  |  | 40,160 |  |  |  | 40,751 |
| Percentage allocated to common shareholders |  | 98.7 | % |  |  | 98.7 | % |  |  | 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://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=124432515&loc=d3e3550-109257 + Details
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