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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Weighted-Average Assumptions For The Employee Stock Option Plan | The fair value of each option grant in the employee stock option plan was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the indicated periods:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Dividend Yield (1) | 2.64 | % |  | 2.67 | % |  | 2.70 | % |  | 2.64 | %
Expected volatility (2) | 44.90 | % |  | 46.91 | % |  | 45.61 | % |  | 45.17 | %
Risk-free interest rate (3) | 1.39 | % |  | 0.64 | % |  | 1.19 | % |  | 0.79 | %
Expected term of options (years) (4) | 4.00 |  |  | 4.05 |  |  | 4.01 |  |  | 4.04 |
Weighted-avg. grant date fair value | $7.61 |  | $5.23 |  | $6.98 |  | $6.09
(1)Represents the Company’s estimated cash dividend yield over the expected term of option grant.
(2) | Amount is determined based on analysis of historical price volatility of the Company’s common stock. The expected volatility is based on the daily percentage change in the price of the stock over a period equal to the expected term of the option grant.
(3) | Represents the U.S. Treasury yield over the expected term of the option grant.
(4) | Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the Company has determined that all employee groups exhibit similar exercise and post-vesting termination behavior.

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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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