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Assets Held for Sale and Discontinued Operations - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 01, 2015
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment charge   $ 29,000,000 $ 29,403,000   $ 22,500,000
Other Receivables, Gross, Current         2,000,000
2015 Journal acquisition          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash dividend $ 60,000,000        
Proceeds from services provided to merger partner         3,300,000
Payments for services provided by merger partner         1,200,000
Spinoff          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transaction costs expensed         41,000,000
Disposal Group, including discontinued operation, professional fees         3,000,000
Spinoff | 2015 Journal acquisition          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of long-lived assets, held-for-sale $ 30,000,000        
Radio | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment charge     $ 8,000,000 $ 0 $ 0