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Asset Write-Downs and Other Charges and Credits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 2,330 $ 0 $ 6,137 $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Newspaper Syndication        
Restructuring Cost and Reserve [Line Items]        
Gain on disposal   3,000    
Midroll        
Restructuring Cost and Reserve [Line Items]        
Reduction in earn out provision   $ 2,500