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Stockholders' Equity and Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity and Earnings Per Share [Abstract] |
Schedule of earnings per share calculations | The following table presents the EPS calculations for the three months ended March 31, 2018 and 2017:
($ and shares in thousands, except per share data) |  | Three Months Ended March 31,
| 2018 |  | 2017
Basic |  |  |  |
Net income |  | $ | 187,032 |  |  | $ | 169,736 |
Basic weighted-average number of shares outstanding |  | 144,664 |  |  | 144,249 |
Basic EPS |  | $ | 1.29 |  |  | $ | 1.18 |
Diluted |  |  |  |
Net income |  | $ | 187,032 |  |  | $ | 169,736 |
Basic weighted-average number of shares outstanding |  | 144,664 |  |  | 144,249 |
Diluted potential common shares (1) |  | 1,275 |  |  | 1,483 |
Diluted weighted-average number of shares outstanding |  | 145,939 |  |  | 145,732 |
Diluted EPS |  | $ | 1.28 |  |  | $ | 1.16 |
(1) | Includes dilutive shares from RSUs and warrants for the three months ended March 31, 2018 and 2017.

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- Definition Stockholders' Equity and Earnings Per Share [Abstract] + References No definition available. + Details
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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/2003/role/presentationRef -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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