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Employee Benefit Plans Phantom Stock (Details) (Phantom Stock Plan, USD $)
1 Months Ended 12 Months Ended
May 31, 2011
payment
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of installment payments 2emax_PhantomStockNumberofPayments      
Reversal of contingency related to a long term employee incentive plan   $ 2,400,000emax_Reversalofcontingencyrelatedtoalongtermemployeeincentiveplan    
Phantom stock compensation expense   $ 0us-gaap_AllocatedShareBasedCompensationExpense $ 1,600,000us-gaap_AllocatedShareBasedCompensationExpense $ (300,000)us-gaap_AllocatedShareBasedCompensationExpense
Phantom Share Units (PSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom stock shares issued in period   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= emax_PhantomStockPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PhantomShareUnitsPSUsMember
1,104us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= emax_PhantomStockPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PhantomShareUnitsPSUsMember
 
Phantom Share Units (PSUs) | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Phantom stock shares authorized   5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= emax_PhantomStockPlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PhantomShareUnitsPSUsMember