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Accounting Policies Stock Option Assumptions (Tables) | 12 Months Ended
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Dec. 31, 2015
Share-based Compensation [Abstract] |
Schedule of Share-based Payment Award, Valuation Assumptions [Table Text Block] | The following table contains the weighted-average assumptions used to estimate the fair value of options granted. These assumptions are highly subjective and changes in these assumptions can materially affect the fair value estimate.
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
Expected dividend yield | 1.0 | % |  | 1.2 | % |  | 1.2 | %
Expected stock price volatility | 33.3 | % |  | 38.5 | % |  | 43.7 | %
Weighted average risk-free interest rate | 1.6 | % |  | 1.6 | % |  | 0.9 | %
Expected life of options (years) | 5.9 |  |  | 5.3 |  |  | 5.2 |
The fair value of non-vested shares issued were estimated using the closing market prices for the business day of the grant. The share-based compensation for the non-vested shares is recognized, net of estimated forfeitures, ratably over the requisite service period or vesting period. Forfeitures are estimated based on our historical experience, but will be adjusted for future changes in forfeiture experience. The fair value of the performance shares was estimated using a Monte Carlo simulation. The share-based compensation for performance shares are recognized, net of estimated forfeitures, ratably over the requisite service period, or vesting period. The following table contains the weighted-average assumptions used to estimate the fair value of performance shares granted. These assumptions are highly subjective and changes in these assumptions can materially affect the fair value estimate.
|  |  | Year ended |  |
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
Expected stock price volatility | 23.5 | % |  | 32.5 | % |  | 34.5 | %
Weighted average risk-free interest rate | 1.0 | % |  | 0.7 | % |  | 0.4 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of share-based payment awards, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, and (d) risk-free rate(s). + References No definition available. + Details
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- References No definition available. + Details
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