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Goodwill and Other Intangible Assets - Goodwill (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Goodwill, gross, beginning balance $ 1,023,266
Accumulated impairment losses, beginning balance (267,317)
Goodwill net, beginning balance 755,949
Goodwill, gross, ending balance 1,027,415
Accumulated impairment losses, ending balance (267,317)
Goodwill net, ending balance 760,098
Local Media  
Goodwill [Roll Forward]  
Goodwill, gross, beginning balance 708,133
Accumulated impairment losses, beginning balance (216,914)
Goodwill net, beginning balance 491,219
Goodwill, gross, ending balance 708,133
Accumulated impairment losses, ending balance (216,914)
Goodwill net, ending balance 491,219
National Media  
Goodwill [Roll Forward]  
Goodwill, gross, beginning balance 315,133
Accumulated impairment losses, beginning balance (50,403)
Goodwill net, beginning balance 264,730
Goodwill, gross, ending balance 319,282
Accumulated impairment losses, ending balance (50,403)
Goodwill net, ending balance $ 268,879