Stock-Based Compensation - Weighted-Average Assumptions Used in Option Pricing Model (Details) (Stock Option, USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Stock Option
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Schedule of Share-Based Compensation Award, Options, Fair Value Assumption Inputs | |||
Weighted average grant date fair value of options granted (in dollars per share) | $ 3.54 | $ 4.06 | $ 4.30 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] | |||
Expected volatility | 30.61% | 37.46% | 36.36% |
Expected dividend yield | 3.00% | 3.35% | 3.17% |
Risk-free interest rate | 0.88% | 1.99% | 3.05% |
Expected life of options (in years) | 5 years 6 months 6 days | 7 years 10 months 6 days | 7 years 11 months 19 days |
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- Details
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- Details
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- 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
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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
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- 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
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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