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Indebtedness (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 03, 2015
Dec. 31, 2014
Mar. 18, 2011
Debt Instrument [Line Items]      
Long-term debt $ 574,420us-gaap_LongTermDebt $ 539,515us-gaap_LongTermDebt  
Current portion of long-term debt 450,012us-gaap_LongTermDebtCurrent 4,663us-gaap_LongTermDebtCurrent  
Long-term debt, excluding current maturities 124,408us-gaap_LongTermDebtNoncurrent 534,852us-gaap_LongTermDebtNoncurrent  
Senior notes | Senior Secured Notes (9.50%)      
Debt Instrument [Line Items]      
Long-term debt 375,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
375,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Current portion of long-term debt 375,000us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  375,000us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Unsecured debt | Senior Unsecured Loan Facility (12.25%)      
Debt Instrument [Line Items]      
Long-term debt 124,408us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorUnsecuredLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
124,233us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_SeniorUnsecuredLoanFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
 
Line of credit | ABL Credit Facility      
Debt Instrument [Line Items]      
Long-term debt 59,826us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
35,619us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Current portion of long-term debt 59,800us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Foreign Line of Credit | Dutch Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt 14,163us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_DutchRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
3,532us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_DutchRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
 
Foreign Line of Credit | French receivables financing facility      
Debt Instrument [Line Items]      
Long-term debt $ 1,023us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_FrenchreceivablesfinancingfacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember
$ 1,131us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= emax_FrenchreceivablesfinancingfacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ForeignLineOfCreditMember