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Operations and Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 03, 2015
Dec. 31, 2014
Mar. 18, 2011
Debt Instrument [Line Items]      
Current portion of long-term debt $ 450,012us-gaap_LongTermDebtCurrent $ 4,663us-gaap_LongTermDebtCurrent  
Senior Secured Notes (9.50%) | Senior notes      
Debt Instrument [Line Items]      
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
Debt instrument, interest rate, stated percentage     9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= emax_SeniorSecuredNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
ABL Credit Facility | Line of credit      
Debt Instrument [Line Items]      
Current portion of long-term debt $ 59,800us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= emax_AblCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember