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Equity-Based Compensation Expense (Tables)
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9 Months Ended | ||||||||||||||||||
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Sep. 30, 2013
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| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |||||||||||||||||||
| Black-Scholes Option-Pricing Model Assumptions | The fair value of the Options granted during the nine months ended September 30, 2013 was estimated on the grant date using the Black-Scholes option-pricing model based on the following assumptions:
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