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Commitments and Contingencies Collective Bargaining (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Concentration Risk [Line Items]      
Concentration risk, percentage 12.40%us-gaap_ConcentrationRiskPercentage1 13.50%us-gaap_ConcentrationRiskPercentage1 13.30%us-gaap_ConcentrationRiskPercentage1
Workforce Subject to Collective Bargaining Arrangements      
Concentration Risk [Line Items]      
Concentration risk, percentage 10.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember		    
Work Force Council      
Concentration Risk [Line Items]      
Concentration risk, percentage 31.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= emax_WorkForceCouncilMember		    
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year      
Concentration Risk [Line Items]      
Concentration risk, percentage 1.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember