Share-Based Compensation - Liability Classified Valuation Table (Details) - Performance Share Units [Member]	6 Months Ended
Jun. 30, 2018
Grant Date Assumptions [Member] \| 2017 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	80.65%
Risk-free interest rate	1.54%
Dividend yield	0.00%
Grant Date Assumptions [Member] \| 2016 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	49.74%
Risk-free interest rate	1.13%
Dividend yield	0.00%
Reporting Period Assumptions [Member] \| 2017 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	51.31%
Risk-free interest rate	2.43%
Dividend yield	0.00%
Reporting Period Assumptions [Member] \| 2016 Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	59.84%
Risk-free interest rate	2.11%
Dividend yield	0.00%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The estimated measure of the 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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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.

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No definition available.

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