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Weighted-Average Assumptions Used in Monte Carlo Simulation (Details) (Restricted Stock Units)
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9 Months Ended |
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Sep. 30, 2014
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Restricted Stock Units
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| Schedule Of Restricted Stock [Line Items] | |
| Expected volatility | 17.78% |
| Risk-free interest rate | 0.75% |
| Expected life (years) | 3 years |