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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Computation of Earnings (Loss) Per Common Share | A summary of the information used in the computation of earnings (loss) per common share follows.
| Years Ended December 31, |
($ in thousands, except per share data) | 2022 |  | 2021 |  | 2020 |
Numerator: |  |  |  |  |  |
Net income (loss) to common shareholders | $ | 524,089 |  | $ | 463,215 |  | $ | (45,174 | )
Net income or dividends allocated to participating securities - basic and diluted |  | 7,620 |  |  | 9,134 |  |  | 1,756 |
Net income (loss) allocated to common shareholders - basic and diluted | $ | 516,469 |  | $ | 454,081 |  | $ | (46,930 | )
Denominator: |  |  |  |  |  |
Weighted-average common shares - basic |  | 86,068 |  |  | 86,823 |  |  | 86,533 |
Dilutive potential common shares |  | 326 |  |  | 204 |  |  | — |
Weighted average common shares - diluted |  | 86,394 |  |  | 87,027 |  |  | 86,533 |
Earnings (loss) per common share: |  |  |  |  |  |
Basic | $ | 6.00 |  | $ | 5.23 |  | $ | (0.54 | )
Diluted | $ | 5.98 |  | $ | 5.22 |  | $ | (0.54 | )

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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