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Intangible Assets and Goodwill - Goodwill and FCC Licenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]      
Goodwill, Gross $ 2,257,774 $ 2,212,755 $ 534,557
Goodwill, Accumulated Impairment (89,820) (69,909) (61,253)
Goodwill, Net 2,167,954 2,142,846 473,304
Goodwill Acquisitions, Gross 45,019 1,701,719  
Goodwill Acquisitions, Accumulated Impairment (19,911) (11,517) (15,262)
Goodwill Acquisitions and Consolidations of VIEs, Net 45,019 1,701,719  
Goodwill Nexstar Divestitures, Gross   (22,823)  
Goodwill Nexstar Divestitures, Accumulated Impairment   2,861  
Goodwill Nexstar Divestitures, Net   (19,962)  
Goodwill Deconsolidations of a VIEs, Gross   (698)  
Goodwill Deconsolidations of a VIEs, Net   (698)  
FCC Licenses [Abstract]      
FCC Licenses, Gross 1,825,678 1,815,048 591,945
FCC Licenses, Accumulated Impairment (47,410) (47,410) (49,421)
FCC Licenses, Net 1,778,268 1,767,638 $ 542,524
FCC Licenses Acquisitions, Gross 10,630 1,244,386  
FCC Licenses Acquisitions and Consolidations of VIEs, Net $ 10,630 1,244,386  
FCC Licenses Divestitures, Gross   (19,744)  
FCC Licenses Nexstar Divestitures, Accumulated Impairment   2,011  
FCC Licenses Nexstar Divestitures, Net   (17,733)  
FCC Licenses Deconsolidations of a VIEs, Gross   (1,539)  
FCC Licenses Deconsolidations of a VIEs, Net   $ (1,539)