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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Earnings (loss) per share were computed as follows (dollars in millions, except per-share amounts):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Weighted average shares: |  |  |  |  |
Basic weighted average shares outstanding | 50,996,297 |  |  | 50,789,173 |  |  | 50,692,942 |
Effect of dilutive securities outstanding | — |  |  | 590,525 |  |  | 370,247 |
Diluted weighted average and equivalent shares outstanding | 50,996,297 |  |  | 51,379,698 |  |  | 51,063,189 |
Net (loss) income | $ | (137 | ) |  | $ | 32 |  |  | $ | 134 |
Basic per share amounts: |  |  |  |  |
Basic weighted average shares outstanding | 50,996,297 |  |  | 50,789,173 |  |  | 50,692,942 |
Per share amount | $ | (2.69 | ) |  | $ | 0.64 |  |  | $ | 2.65 |
Diluted per share amounts: |  |  |  |  |
Diluted weighted average shares outstanding | 50,996,297 |  |  | 51,379,698 |  |  | 51,063,189 |
Per share amount | $ | (2.69 | ) |  | $ | 0.63 |  |  | $ | 2.63 |
Anti-dilutive securities consist primarily of stock appreciation rights (SARs) with an exercise price greater than the average market closing price of the Class A common stock. Due to a net loss in 2015, options, awards and warrants were anti-dilutive and therefore excluded from the 2015 earnings per share calculation. For years 2014 and 2013, options and awards were included in the earnings per share calculation. These excluded outstanding options, awards and warrants are as follows:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Potentially dilutive shares | 1,421,506 |  |  | 175,902 |  |  | 168,472 |

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