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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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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.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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)(i)
-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 S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Shareholders' Equity - Schedule of Assumptions Used (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2015
Performance- based common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life		1 year 15 days
Volatility		32.97%
Risk-free interest rate		1.17%
Performance-based stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life		11 months 27 days
Volatility		39.58%
Risk-free interest rate		1.43%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life				7 years
Volatility				58.06%
Risk-free interest rate				1.94%
SARS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life	2 years	4 years 9 months 18 days	4 years	2 years 1 month
Volatility	34.00%	34.00%	36.00%	34.00%
Risk-free interest rate	0.79%	2.23%	1.65%	0.94%