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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Goodwill [Roll Forward]    
Goodwill, gross, beginning balance   $ 1,101,330
Accumulated impairment losses, beginning balance   (267,317)
Goodwill net, beginning balance   834,013
Goodwill, gross, ending balance $ 1,119,679  
Accumulated impairment losses, ending balance (267,317)  
Goodwill net, ending balance 852,362  
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 726,482  
Accumulated impairment losses, ending balance (216,914)  
Goodwill net, ending balance 509,568  
National Media    
Goodwill [Roll Forward]    
Goodwill, gross, beginning balance   393,197
Accumulated impairment losses, beginning balance   (50,403)
Goodwill net, beginning balance   $ 342,794
Goodwill, gross, ending balance 393,197  
Accumulated impairment losses, ending balance (50,403)  
Goodwill net, ending balance $ 342,794