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Share-based compensation | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based compensation | Share-based compensation Amended and Restated Stock Incentive Plan — We award restricted share awards and grant qualified incentive and nonqualified stock options to our salaried officers, non-employee directors, and other key employees from our Amended and Restated Stock Incentive Plan (the "Stock Incentive Plan"). The Stock Incentive Plan has 10,000,000 shares authorized for issuance with approximately 6,832,000 shares remaining at December 31, 2015. Our share-based compensation consists of service-based (time vested) and performance share awards that typically vest over a period of three years from the date of grant, provided that the recipient is still our employee at the time of vesting. Our independent non-employee directors receive annual grants of service-based share awards that vest following 12 months of service. In the past, we have granted stock options that have a term of 10 years and typically vest one-third on the grant date and an additional one-third on the first and second anniversary dates of the grant. Our most recent grant of stock options was in 2009. As of December 31, 2015, options to purchase 443,737 shares of common stock and 541,304 service-based share awards were outstanding. A summary of activity under our Stock Incentive Plan during the year ended December 31, 2015 is presented below:
Options | Number | Weighted Average Exercise Price | Weighted Average Remaining Contractual Term (years) | Aggregate Intrinsic Value
Outstanding at January 1, 2015 | 544,171 |  | $ | 26.85 |  |  |
Exercised | — |  | — |  |  |
Forfeited/expired | (100,434 | ) | 25.95 |  |  |
Outstanding, fully vested and exercisable at December 31, 2015 (1) | 443,737 |  | $ | 27.06 |  | 2.19 | $ | — |
(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.
Long-Term Incentive Plan — We also grant annual long-term incentive awards under our Amended and Restated Long-Term Incentive Plan (the "LTIP"). The LTIP is designed to provide senior-level employees the opportunity to earn long-term incentive awards through the achievement of performance goals and to align compensation with the interests of our stockholders by linking compensation to share price appreciation and total stockholder return over a multi-year period. Awards made under the LTIP are granted subject to the Stock Incentive Plan to the extent the award is deliverable in stock. We provide two types of LTIP awards: time-vested performance share units and performance units. Time-vested share units are stock-settled awards (which do not contain any performance-based vesting requirements) that are granted at the beginning of the performance period. Performance units are generally cash-settled awards (although the Board of Directors retains the discretion to settle these awards in stock) and vest based on the achievement of pre-determined performance metrics, subject to the discretion of the Board. We recorded a performance unit liability for approximately $4,853 and $6,251 as of December 31, 2015 and 2014, respectively. Both the performance units and time-vested share units vest, in their entirety, after three years.
Service-based share awards |
Outstanding at January 1, 2015 | 464,485 |
Granted | 478,798 |
Vested | (354,688 | )
Forfeited | (47,291 | )
Outstanding at December 31, 2015 | 541,304 |
| Year ended December 31,
| 2015 | 2014 | 2013
Weighted average per share fair value of service-based share grants | $ | 4.21 |  | $ | 15.31 |  | $ | 8.19 |
Total intrinsic value of option exercises | — |  | 1,011 |  | 13 |
Fair Value Measurement of Share-Based Compensation Awards – We estimate the fair value of each stock option award using the Black-Scholes model on the date of grant. We have not granted any stock options since 2009. For our service-based awards, fair value is equal to the closing stock price on the date of grant. For our performance-based awards, fair value is equal to the closing stock price at each reporting period end. The following table summarizes the compensation cost recognized for the years ended December 31, 2015, 2014 and 2013 for all options, service-based share and performance-based share awards. This expense is included as part of selling, general and administrative expenses in our Consolidated Statements of Operations.
| Year ended December 31,
| 2015 | 2014 | 2013
Share-based compensation expense reported: |  |  |
Performance-based share expense | $ | 1,587 |  | $ | 1,090 |  | $ | 475 |
Service-based share expense | 257 |  | 244 |  | 603 |
Stock option expense | — |  | — |  | — |
Total share-based compensation expense before income tax | 1,844 |  | 1,334 |  | 1,078 |
Income tax | — |  | — |  | — |
Total share-based compensation expense, net of income tax | $ | 1,844 |  | $ | 1,334 |  | $ | 1,078 |
No share-based compensation cost was capitalized during these periods and there were no significant modifications of any share-based awards in 2015, 2014 and 2013. As of December 31, 2015, we had unrecognized compensation expense of $2,334 before taxes. This expense will be recognized over a weighted average period of one year.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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