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Equity-Based Compensation (Valuation Assumptions) (Details)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Method used Black-Scholes-Merton
Options or equity warrants granted in period (shares) 0heb_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsandWarrantsGrantsinPeriodGross