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Asset Write-Downs and Other Charges and Credits - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]                      
Impairment of Intangible Assets, Finite-lived                 $ 6,300    
Restructuring costs                 4,422 $ 0 $ 0
Impairment charge   $ 29,000             29,403   22,500
Acquisition and related integration costs                 0 578 37,988
Impairment of goodwill and intangibles $ 0 $ 35,732 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 35,732 $ 0 $ 24,613
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Newspaper Syndication [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal                 3,000    
Employee Severance [Member]                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 3,500    
2015 Midroll acquisition                      
Restructuring Cost and Reserve [Line Items]                      
Business Combination, Earn-Out Provision, Adjustment                 $ 3,200    
Katz Broadcasting Group                      
Restructuring Cost and Reserve [Line Items]                      
Gain recorded on investments $ 5,400