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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]          
Estimated amortization expense of intangible assets for 2018     $ 27,500    
Estimated amortization expense of intangible assets for 2019     26,100    
Estimated amortization expense of intangible assets for 2020     24,900    
Estimated amortization expense of intangible assets for 2021     22,500    
Estimated amortization expense of intangible assets for 2022     20,300    
Estimated amortization expense of intangible assets for later years     147,500    
Goodwill [Line Items]          
Impairment charge $ 29,000   29,403   $ 22,500
Impairment of Intangible Assets, Finite-lived     6,300    
Newsy          
Goodwill [Line Items]          
Impairment charge   $ 21,000      
Impairment of Intangible Assets (Excluding Goodwill)   $ 2,900      
Second small business          
Goodwill [Line Items]          
Impairment charge       $ 1,500  
Cable And Satellite Carriage Rights          
Goodwill [Line Items]          
Intangible assets acquired     $ 9,700