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Fair Value Measurements (Details) (USD $)
3 Months Ended
Apr. 03, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Long-term debt $ 574,420,000us-gaap_LongTermDebt $ 539,515,000us-gaap_LongTermDebt
Senior notes | Senior Secured Notes (9.50%)    
Derivatives, Fair Value [Line Items]    
Long-term debt 375,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
375,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Fair Value, Inputs, Level 2 | Senior notes | Senior Secured Notes (9.50%)    
Derivatives, Fair Value [Line Items]    
Fair value of long-term debt 355,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
346,900,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Not Designated as Hedging Instrument | Current assets | Foreign Exchange Contract | Fair Value, Inputs, Level 2    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset   500,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Derivative, gain (loss) on derivative, net $ 800,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember