Fair Value Measurements and Derivative Instrument (Significant Assumptions) (Details) - Stock Appreciation Rights (SARs) |
9 Months Ended |
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Sep. 30, 2017
$ / shares
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| Derivative [Line Items] | |
| Stock price (USD per share) | $ 40.79 |
| Minimum | |
| Derivative [Line Items] | |
| Contractual term (in years) | 1 year 4 months 4 days |
| Volatility (percent) | 20.00% |
| Risk-free interest rate | 1.00% |
| Maximum | |
| Derivative [Line Items] | |
| Contractual term (in years) | 5 years 4 months 1 day |
| Volatility (percent) | 40.00% |
| Risk-free interest rate | 2.00% |
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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. No definition available.
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Price of a single share of a number of saleable stocks of a company. No definition available.
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