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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of options, fully vested and exercisable | A summary of activity under our Stock Incentive Plan during the year ended December 31, 2017 is presented below:
Options |  | Number |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2017 |  | 359,570 |  |  | $ | 24.95 |  |  |  |  |
Exercised |  | (61,648 | ) |  |  |  |  |  |  |
Forfeited/expired |  | (131,165 | ) |  | 51.00 |  |  |  |  |
Outstanding, fully vested and exercisable at December 31, 2017 (1) |  | 166,757 |  |  | $ | 11.02 |  |  | 1.24 |  | $ | 1,954 |
(1) | As the result of actions in 2011 that were determined to be a "change of control" under the Stock Incentive Plan, all options will remain exercisable for their respective remaining term, regardless of whether the awardees remain employees of Century. Of the 166,757 outstanding options at December 31, 2017 there are 149,257 options with an exercise price of $6.55 per share that expire in May 2019.
Summary of service-based share awards activity |
Service-based share awards |  | Number
Outstanding at January 1, 2017 |  | 741,036 |
Granted |  | 337,951 |
Vested |  | (172,526 | )
Forfeited |  | (61,053 | )
Outstanding at December 31, 2017 |  | 845,408 |
| Year ended December 31,
Service-based share awards | 2017 |  | 2016 |  | 2015
Weighted average per share fair value of service-based share grants | $ | 8.92 |  |  | $ | 7.14 |  |  | $ | 4.21 |
Total intrinsic value of option exercises | 624 |  |  | — |  |  | — |
Summary of share-based compensation expense | The following table summarizes the compensation cost recognized for the years ended December 31, 2017, 2016 and 2015 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,
| 2017 |  | 2016 |  | 2015
Share-based compensation expense reported: |  |  |  |  |
Performance-based share expense | $ | 3,968 |  |  | $ | 2,402 |  |  | $ | 2,645 |
Service-based share expense | 3,433 |  |  | 2,105 |  |  | 428 |
Total share-based compensation expense before income tax | 7,401 |  |  | 4,507 |  |  | 3,073 |
Income tax | — |  |  | — |  |  | — |
Total share-based compensation expense, net of income tax | $ | 7,401 |  |  | $ | 4,507 |  |  | $ | 3,073 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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