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Assets Held for Sale and Discontinued Operations - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
radio_station
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment charge   $ 29,400      
Disposal Group, including discontinued operation, professional fees     $ 2,500    
Radio | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of Radio Stations | radio_station     34    
Impairment charge $ 8,000   $ 25,900 $ 8,000 $ 0
Non-deductible charges $ 8,000   $ 30,900