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Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Subsequent Recognition of Deferred Tax Asset $ 631us-gaap_GoodwillSubsequentRecognitionOfDeferredTaxAsset  
Finite-Lived Intangible Assets, Amortization Expense 11us-gaap_AmortizationOfIntangibleAssets 6us-gaap_AmortizationOfIntangibleAssets
National Networks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Subsequent Recognition of Deferred Tax Asset $ (631)us-gaap_GoodwillSubsequentRecognitionOfDeferredTaxAsset
/ us-gaap_StatementBusinessSegmentsAxis
= amcx_NationalNetworksMember