Goodwill and Other Intangible Assets - Goodwill (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 1,539,172
Accumulated impairment losses, beginning balance	(267,317)
Goodwill net, beginning balance	1,271,855
Goodwill, gross, ending balance	1,542,644
Accumulated impairment losses, ending balance	(267,317)
Goodwill net, ending balance	1,275,327
Local Media
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	1,143,859
Accumulated impairment losses, beginning balance	(216,914)
Goodwill net, beginning balance	926,945
Goodwill, gross, ending balance	1,147,347
Accumulated impairment losses, ending balance	(216,914)
Goodwill net, ending balance	930,433
National Media
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	395,313
Accumulated impairment losses, beginning balance	(50,403)
Goodwill net, beginning balance	344,910
Goodwill, gross, ending balance	395,297
Accumulated impairment losses, ending balance	(50,403)
Goodwill net, ending balance	$ 344,894