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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Net Income Per Share |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net loss allocable to common stockholders (in millions) | $ | (10.5 | ) |  | $ | (41.3 | ) |  | $ | (28.3 | ) |  | $ | (58.8 | )
Shares in thousands: |  |  |  |  |  |  |
Average common shares outstanding - basic | 9,103 |  |  | 9,096 |  |  | 9,081 |  |  | 9,102 |
Potentially dilutive shares related to stock options (a) | — |  |  | — |  |  | — |  |  | — |
Average common shares outstanding - diluted | 9,103 |  |  | 9,096 |  |  | 9,081 |  |  | 9,102 |
Net loss per common share – basic and diluted | $ | (1.15 | ) |  | $ | (4.54 | ) |  | $ | (3.12 | ) |  | $ | (6.46 | )
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands) | 13 |  |  | 14 |  |  | 60 |  |  | 7 |
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands) | 327 |  |  | 375 |  |  | 30 |  |  | 490 |

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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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