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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock-Based Compensation |
Schedule of stock-based compensation fair value assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Expected life (years) | ​ | 3.0 | ​ | 3.0 | ​
Expected stock price volatility |  | 23.3 | % | 24.1 | %
Expected dividend yield |  | 1.1 | % | 1.0 | %
Risk-free interest rate |  | 2.5 | % | 2.4 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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