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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Four quarterly assumptions for the fair value of the right (option) to purchase shares under ESPP | The fair value of the right (option) to purchase shares under the ESPP is estimated on the date of grant (January 1, 2013) associated with the four quarterly purchase dates using the following assumptions:
| 2012 |  | 2013
Dividend yield | 1.7 | % |  | 0.6 | %
Expected volatility | 32 | % |  | 31 | %
Risk-free interest rate | 0.02%, 0.06%, 0.09%, 0.12% |  |  | 0.08%, 0.12%, 0.135%, 0.15% |
Expected life (years) | 0.25, 0.50, 0.75, 1.00 |  |  | 0.25, 0.50, 0.75, 1.00 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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