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LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Interest Expense      
Interest expense $ 34,656us-gaap_InterestExpenseDebtExcludingAmortization $ 40,091us-gaap_InterestExpenseDebtExcludingAmortization $ 47,412us-gaap_InterestExpenseDebtExcludingAmortization
Amortization of deferred financing costs 3,860etm_AmortizationOfDeferredFinanceCosts 3,870etm_AmortizationOfDeferredFinanceCosts 4,405etm_AmortizationOfDeferredFinanceCosts
Amortization of original issue discount of senior notes 305us-gaap_AmortizationOfDebtDiscountPremium 274us-gaap_AmortizationOfDebtDiscountPremium 246us-gaap_AmortizationOfDebtDiscountPremium
Interest expense on interest rate hedging agreements 0etm_InterestExpenseOnInterestRateHedges 0etm_InterestExpenseOnInterestRateHedges 1,392etm_InterestExpenseOnInterestRateHedges
Interest income and other investment income 0us-gaap_InterestAndOtherIncome (3)us-gaap_InterestAndOtherIncome (9)us-gaap_InterestAndOtherIncome
Total net interest expense 38,821us-gaap_InterestExpense 44,232us-gaap_InterestExpense 53,446us-gaap_InterestExpense
Extinguishment of Debt Disclosures [Abstract]      
Write-off of unamortized deferred financing costs 0us-gaap_WriteOffOfDeferredDebtIssuanceCost 0us-gaap_WriteOffOfDeferredDebtIssuanceCost 747us-gaap_WriteOffOfDeferredDebtIssuanceCost
Amount of debt retired early $ 0us-gaap_EarlyRepaymentOfSeniorDebt $ 69us-gaap_EarlyRepaymentOfSeniorDebt $ 0us-gaap_EarlyRepaymentOfSeniorDebt