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Asset Write-Downs and Other Charges and Credits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring costs $ 863 $ 2,407   $ 7,000 $ 2,407
Acquisition and related integration costs 332 0   332 0
Impairment of goodwill and intangible assets $ 0 35,732   $ 0 35,732
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   800     $ 3,300
Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring costs   $ 1,900