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Share-Based Compensation - Performance Units/Performance Share Units - Fair Value Assumptions (Details) - $ / shares | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
Performance Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected price volatility range, minimum | 30.70% | 26.60%
Expected price volatility range, maximum | 148.50% | 86.60%
Weighted-average risk-free interest rate | 0.20% | 0.50%
Weighted-average fair value per unit (usd per unit) | $ 0.17 | $ 13.85
Performance Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected price volatility range, minimum | 29.80% |
Expected price volatility range, maximum | 116.90% |
Weighted-average risk-free interest rate | 0.70% |
Weighted-average fair value per unit (usd per unit) | $ 0.08 |

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- Definition The fair value of awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan). + References No definition available. + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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