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Stockholders' Equity and Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity and Earnings Per Share [Abstract] |
Schedule of earnings per share calculations | The following table presents the EPS calculations for the three and six months ended June 30, 2019 and 2018:
($ and shares in thousands, except per share data) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Basic: |  |  |  |  |  |  |  |
Net income |  | $ | 150,380 |  |  | $ | 172,349 |  |  | $ | 314,404 |  |  | $ | 359,381 |
Basic weighted-average number of shares outstanding |  | 145,546 |  |  | 144,899 |  |  | 145,402 |  |  | 144,782 |
Basic EPS |  | $ | 1.03 |  |  | $ | 1.19 |  |  | $ | 2.16 |  |  | $ | 2.48 |
Diluted: |  |  |  |  |  |  |  |
Net income |  | $ | 150,380 |  |  | $ | 172,349 |  |  | $ | 314,404 |  |  | $ | 359,381 |
Basic weighted-average number of shares outstanding |  | 145,546 |  |  | 144,899 |  |  | 145,402 |  |  | 144,782 |
Diluted potential common shares (1) |  | 506 |  |  | 1,192 |  |  | 614 |  |  | 1,264 |
Diluted weighted-average number of shares outstanding (1) |  | 146,052 |  |  | 146,091 |  |  | 146,016 |  |  | 146,046 |
Diluted EPS |  | $ | 1.03 |  |  | $ | 1.18 |  |  | $ | 2.15 |  |  | $ | 2.46 |
(1) Includes dilutive shares from RSUs for the three and six months ended June 30, 2019, and from RSUs and warrants for the three and six months ended June 30, 2018.

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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://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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