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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Earnings (Loss) Per Share | Earnings (loss) per share were computed as follows (dollars in millions, except share data):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Basic: |  |  |  |  |
Net income (loss) | $ | 17 |  |  | $ | (137 | ) |  | $ | (158 | )
Weighted-average shares outstanding(1) | 53,021,761 |  |  | 51,579,112 |  |  | 50,996,297 |
Basic earnings (loss) per share | $ | 0.33 |  |  | $ | (2.65 | ) |  | $ | (3.10 | )
Diluted: |  |  |  |  |
Net income (loss) | $ | 17 |  |  | $ | (137 | ) |  | $ | (158 | )
Weighted-average shares outstanding(1) | 53,021,761 |  |  | 51,579,112 |  |  | 50,996,297 |
Dilutive shares(2) | 667,071 |  |  | — |  |  | — |
Diluted weighted-average shares outstanding | 53,688,832 |  |  | 51,579,112 |  |  | 50,996,297 |
Diluted earnings (loss) per share | $ | 0.32 |  |  | $ | (2.65 | ) |  | $ | (3.10 | )
(1) In periods of net loss, restricted stock awards that are classified as participating securities are excluded from the weighted-average shares outstanding computation.
(2) In periods of net loss, options are anti-dilutive and therefore excluded from the earnings (loss) per share calculation.

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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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