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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract] |
Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share | The following table presents a reconciliation of the numerators and denominators of the basic and diluted earnings per share calculations:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| Income (Numerator) |  | Weighted Shares (Denominator) |  | Per-Share Amount |  | Income (Numerator) |  | Weighted Shares (Denominator) |  | Per-Share Amount |  | Income (Numerator) |  | Weighted Shares (Denominator) |  | Per-Share Amount
| (Amounts and numbers in thousands, except per-share data)
Basic EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders | $ | 144,877 |  |  | 55,316 |  |  | $ | 2.62 |  |  | $ | 73,044 |  |  | 55,249 |  |  | $ | 1.32 |  |  | $ | 74,479 |  |  | 55,157 |  |  | $ | 1.35 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options | — |  |  | 11 |  |  |  |  | — |  |  | 11 |  |  |  |  | — |  |  | 15 |  |  |
RSUs | — |  |  | — |  |  |  |  | — |  |  | 42 |  |  |  |  | — |  |  | 37 |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income available to common stockholders after assumed conversions | $ | 144,877 |  |  | 55,327 |  |  | $ | 2.62 |  |  | $ | 73,044 |  |  | 55,302 |  |  | $ | 1.32 |  |  | $ | 74,479 |  |  | 55,209 |  |  | $ | 1.35 |

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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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