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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of options, fully vested and exercisable | A summary of activity under our Stock Incentive Plan during the year ended December 31, 2019 is presented below:
Options |  | Number |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2019 |  | 117,110 |  |  | $ | 6.55 |  |  |  |  |
Exercised |  | (40,049 | ) |  | 6.55 |  |  |  |  |
Forfeited/expired |  | (77,061 | ) |  | 6.55 |  |  |  |  |
Outstanding, fully vested and exercisable at December 31, 2019 (1) |  | — |  |  | $ | — |  |  | — |  |  | $ | — |
(1) As the result of actions in 2011 that were determined to be a "change of control" under the Stock Incentive Plan, all options remained exercisable for their respective remaining term, regardless of whether the awardees remained employees of Century. There are no outstanding stock options as of December 31, 2019.
Summary of service-based share awards activity |
Service-based share awards |  | Number
Outstanding at January 1, 2019 |  | 658,906 |
Granted |  | 613,043 |
Vested |  | (288,530 | )
Forfeited |  | (62,001 | )
Outstanding at December 31, 2019 |  | 921,418 |
Performance-based share awards |  | Number
Outstanding at January 1, 2019 |  | 608,301 |
Granted |  | 571,369 |
Vested |  | (302,342 | )
Forfeited |  | (33,265 | )
Outstanding at December 31, 2019 |  | 844,063 |
| Year ended December 31,
Service-based share awards | 2019 |  | 2018 |  | 2017
Weighted average per share fair value of service-based share grants | $ | 11.34 |  |  | $ | 20.21 |  |  | $ | 8.92 |
Total intrinsic value of option exercises | 39 |  |  | 444 |  |  | 624 |
Summary of share-based compensation expense | The following table summarizes the compensation cost recognized for the years ended December 31, 2019, 2018 and 2017 for all options, service-based and performance-based share awards. The compensation cost is included as part of selling, general and administrative expenses in our Consolidated Statements of Operations.
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
Share-based compensation expense reported: |  |  |  |  |
Performance-based share expense | $ | 3.0 |  |  | $ | (0.1 | ) |  | $ | 4.0 |
Service-based share expense | 3.5 |  |  | 3.8 |  |  | 3.4 |
Total share-based compensation expense before income tax | 6.5 |  |  | 3.7 |  |  | 7.4 |
Income tax | — |  |  | — |  |  | — |
Total share-based compensation expense, net of income tax | $ | 6.5 |  |  | $ | 3.7 |  |  | $ | 7.4 |

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