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.

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

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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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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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Share-Based Compensation (Valuation Assumptions) (Details) - First Portion - 2008 plan - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
2018 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.39%
Historical volatility factor	19.00%
2017 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		1.43%
Historical volatility factor		20.00%
2016 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.01%
Historical volatility factor			19.00%