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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Computation of Earnings Per Share | A summary of the information used in the computation of earnings per common share follows.
|  | Years Ended December 31, |
($ in thousands, except per share data) |  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income to common shareholders |  | $ |  | 327,380 |  |  | $ |  | 323,770 |  |  | $ |  | 215,632 |
Net income allocated to participating securities -- basic and diluted |  |  |  | 5,546 |  |  |  |  | 5,930 |  |  |  |  | 4,670 |
Net income allocated to common shareholders - basic and diluted |  | $ |  | 321,834 |  |  | $ |  | 317,840 |  |  | $ |  | 210,962 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares - basic |  |  |  | 86,488 |  |  |  |  | 85,355 |  |  |  |  | 84,695 |
Dilutive potential common shares |  |  |  | 111 |  |  |  |  | 166 |  |  |  |  | 268 |
Weighted average common shares - diluted |  |  |  | 86,599 |  |  |  |  | 85,521 |  |  |  |  | 84,963 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ |  | 3.72 |  |  | $ |  | 3.72 |  |  | $ |  | 2.49 |
Diluted |  | $ |  | 3.72 |  |  | $ |  | 3.72 |  |  | $ |  | 2.48 |

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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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