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Weighted-Average Assumptions (Details) (Stock Options, USD $)
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6 Months Ended |
|---|---|
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Jun. 30, 2014
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Stock Options
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |
| Dividend yield | 2.55% |
| Expected volatility | 17.75% |
| Risk-free interest rate | 1.06% |
| Expected life (years) | 3 years 7 months 6 days |
| Exercise price | $ 44.29 |
| Grant date fair value per share | $ 4.57 |