Stock-Based Awards (Weighted Average Assumptions Used In Black-Scholes Option Pricing Model) (Details) |
9 Months Ended |
|---|---|
|
Sep. 30, 2017
Rate
| |
| Maximum Value Stock Appreciation Rights | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Volatility factor | 27.40% |
| Risk-free interest rate | 1.79% |
| Expected term | 4 years 8 months |
| Dividend yield | 3.60% |
| Employee stock purchase plan options (in shares) | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Volatility factor | 35.00% |
| Risk-free interest rate | 0.85% |
| Expected term | 6 months |
| Dividend yield | 4.20% |
| Performance Shares (in shares) | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Volatility factor | 30.00% |
| Risk-free interest rate | 1.40% |
| Expected term | 2 years 11 months |
| Dividend yield | 0.00% |
| X | ||||||||||
- Definition 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://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|