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Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Common Share | 9. Earnings Per Common Share The Company calculates earnings per 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 |
|  | March 31, |
($ in thousands, except per share data) |  | 2023 |  |  | 2022 |
Numerator: |  |  |  |  |  |
Net income to common shareholders |  | $ | 126,467 |  |  | $ | 123,478 |
Net income allocated to participating securities - basic and diluted |  |  | 1,358 |  |  |  | 1,918 |
Net income allocated to common shareholders - basic and diluted |  | $ | 125,109 |  |  | $ | 121,560 |
Denominator: |  |  |  |  |  |
Weighted-average common shares - basic |  |  | 86,018 |  |  |  | 86,660 |
Dilutive potential common shares |  |  | 264 |  |  |  | 276 |
Weighted-average common shares - diluted |  |  | 86,282 |  |  |  | 86,936 |
Earnings per common share: |  |  |  |  |  |
Basic |  | $ | 1.45 |  |  | $ | 1.40 |
Diluted |  | $ | 1.45 |  |  | $ | 1.40 |
Potential common shares consist of stock options, 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. Potential common shares totaling 34,157 for the three months ended March 31, 2023, and 231 for the three months ended March 31, 2022, did not enter the calculation of diluted earnings per share as the impact would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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