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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member]    
Assets    
Cash equivalents $ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Liabilities    
Deferred Compensation 10,970,000etm_DeferredCompensationLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 11,017,000etm_DeferredCompensationLiabilityFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Assets    
Cash equivalents $ 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member