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NET INCOME PER COMMON SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive when reporting loss 0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsWhenReportingNetLoss   0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsWhenReportingNetLoss
Earnings Per Share, Basic and Diluted [Abstract]      
Net Income (Loss) Attributable to Parent $ (93)us-gaap_NetIncomeLoss $ 1,363us-gaap_NetIncomeLoss $ 26,823us-gaap_NetIncomeLoss
Weighted Average Number Of Shares Outstanding Basic 38,026,469us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 37,660,123us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Earnings Per Share Basic $ 0us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic  
Incremental Common Shares Attributable to Share-based Payment Arrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 841,196us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Weighted Average Number Of Diluted Shares Outstanding 38,026,469us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 38,501,319us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Earnings Per Share Diluted $ 0us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted  
Restricted Stock Units Service And Performance Conditions But Performance Not Met [Member]      
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive under the treasury stock method 8,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceAndPerformanceConditionsButPerformanceNotMetMember
  0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceAndPerformanceConditionsButPerformanceNotMetMember
Options Activity [Member]      
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive under the treasury stock method 0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
33,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Price range of option: from $ 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 10.08us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Price range of option: to $ 0us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 35.05us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted Stock Units Activity [Member]      
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive when reporting loss 935,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsWhenReportingNetLoss
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnitsWhenReportingNetLoss
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted Stock Units Activity [Member] | Restricted Stock Units Service Conditions [Member]      
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive under the treasury stock method 207,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceConditionsMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
0etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceConditionsMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted Stock Units Activity [Member] | Restricted Stock Units Service And Market Conditions But Market Not Met [Member]      
Impact Of Equity Awards [Line Items]      
Excluded shares as anti-dilutive under the treasury stock method 262,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceAndMarketConditionsButMarketNotMetMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
290,000etm_AmountOfAntiDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
/ etm_AntiDilutiveRestrictedStockUnitTypeScheduleAxis
= etm_RestrictedStockUnitsServiceAndMarketConditionsButMarketNotMetMember
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember