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Stock-based Compensation - Fair Value Assumptions And Methodology (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair value assumptions and methodology [Abstract] |  |
Expected volatility range of stock, minimum (in hundredths) | 39.80% | 37.40%
Expected volatility range of stock, maximum (in hundredths) | 40.10% | 40.80%
Expected life of option, range in years | 5 years | 5 years
Risk-free interest rate range, minimum (in hundredths) | 2.20% | 1.80%
Risk-free interest rate range, maximum (in hundredths) | 2.80% | 1.90%
Expected dividend yield on stock, minimum (in hundredths) | 0.00% | 0.00%
Expected dividend yield on stock, maximum (in hundredths) | 0.00% | 0.00%

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- Definition The maximum 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. + References No definition available. + Details
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- Definition The estimated minimum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References No definition available. + Details
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- Definition Maximum 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 No definition available. + Details
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- Definition The estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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