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TOWER SALE AND LEASEBACK (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
number
Dec. 31, 2009
number
Dec. 31, 2014
Financing Method Lease Obligations [Abstract]      
Proceeds from sale of tower facilities   $ 12.6us-gaap_ProceedsFromSaleOfProductiveAssets  
Financing liability   12.6us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement  
Deferred Finance Costs, Current, Net   0.2us-gaap_DeferredFinanceCostsCurrentNet  
The partial lease term   42etm_PartialLeaseTermUnderFinancingMethod  
Imputed interest   5.50%us-gaap_SaleLeasebackTransactionImputedInterestRate  
Future Lease Obligations [Line Items]      
Principal portion of total lease obligations   12.6us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement  
Tower Sale And Leaseback [Abstract]      
Operating Lease Remaining Life Amortization Period 16.5etm_OperatingLeaseRemainingLifeAmortizationPeriod    
SaleLeasebackTransactionCurrentPeriodGainRecognized 1.6us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized    
SaleLeasebackTransactionDeferredGainGross 9.9us-gaap_SaleLeasebackTransactionDeferredGainGross    
Sale Leaseback Transaction Deferred Gain Short Term     0.6etm_SaleLeasebackTransactionDeferredGainShortTerm
Sale Leaseback Transaction Deferred Gain Long Term     $ 8.4etm_SaleLeasebackTransactionDeferredGainLongTerm