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Earnings Per Common Share | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Common Share | 11. Earnings Per Common Share The Company calculates earnings per common share using the two-class method. The two-class method allocates net income to each class of common stock and participating security according to common dividends declared and participation rights in undistributed earnings. Participating securities consist of nonvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents. A summary of the information used in the computation of earnings per common share follows.
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
($ in thousands, except per share data) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income to common shareholders |  | $ | 127,466 |  |  | $ | 115,572 |  |  | $ | 360,501 |  |  | $ | 338,741 |
Net income allocated to participating securities - basic and diluted |  |  | 552 |  |  |  | 772 |  |  |  | 1,559 |  |  |  | 2,366 |
Net income allocated to common shareholders - basic and diluted |  | $ | 126,914 |  |  | $ | 114,800 |  |  | $ | 358,942 |  |  | $ | 336,375 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares - basic |  |  | 84,871 |  |  |  | 86,234 |  |  | $ | 85,509 |  |  | $ | 86,421 |
Dilutive potential common shares |  |  | 582 |  |  |  | 326 |  |  |  | 468 |  |  |  | 229 |
Weighted-average common shares - diluted |  |  | 85,453 |  |  |  | 86,560 |  |  | $ | 85,977 |  |  | $ | 86,650 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.50 |  |  | $ | 1.33 |  |  | $ | 4.20 |  |  | $ | 3.89 |
Diluted |  | $ | 1.49 |  |  | $ | 1.33 |  |  | $ | 4.17 |  |  | $ | 3.88 |
Potential common shares consist of nonvested performance-based awards, nonvested restricted stock units, and restricted share awards deferred under the Company’s nonqualified deferred compensation plan. These potential common shares do not enter into the calculation of diluted earnings per share if the impact would be antidilutive, i.e., increase earnings per share or reduce a loss per share. The weighted average of potentially dilutive common shares that were anti-dilutive totaled 5,411 and 4,092 for the three and nine months ended September 30, 2025, and 10,390 and 13,940 for the three and nine months ended September 30, 2024, and were excluded from the calculation of diluted earnings per share for the respective periods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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