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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Summary of Significant Accounting Policies |
Fair value of stock options has been estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: |
|  | 2014 |  | 2013 |  | 2012 |
Risk free interest rate |  | 1.6 | % | 0.9 | % | 0.8 | %
Expected life |  | 4.6 years |  | 4.6 years |  | 4.6 years |
Expected volatility |  | 21.0 | % | 28.0 | % | 30.0 | %
Expected dividend yield |  | 1.0 | % | 1.0 | % | 0.8 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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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