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Earnings Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | Note 15. Earnings Per 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.
|  | 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 |
Potential common shares are excluded from the computation of diluted earnings per share when their inclusion would have had an anti-dilutive effect. Potential common shares can consist of, among other forms, employee and director stock options, unvested performance share awards, and deferred restricted units. Weighted-average anti-dilutive potential common shares of this nature totaled 15,815 for the year ended December 31, 2019, 5,129 for the year ended December 31, 2018, and 10,551 for the year ended December 31, 2017. The diluted earnings per share computation for the year ended December 31, 2019 also excludes the impact of the forward contract related to the October 21, 2019 accelerated share repurchase transaction. Based upon the average daily volume weighted-average price of the Company’s common stock at December 31, 2019, the counterparty to the transaction is expected to deliver additional shares for the settlement of the forward contract upon settlement; as such, the impact of the forward contract related to the accelerated share repurchase transaction would have been anti-dilutive to earnings per share.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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