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Intangible Assets and Goodwill - Goodwill and FCC Licenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Goodwill, Gross $ 2,212,755 $ 534,557 $ 497,653
Goodwill, Accumulated Impairment (69,909) (61,253) (45,991)
Goodwill, Net 2,142,846 473,304 451,662
Goodwill Acquisitions, Gross 1,701,719 36,904  
Goodwill Acquisitions, Accumulated Impairment (11,517) (15,262)  
Goodwill Acquisitions and Consolidations of VIEs, Net 1,701,719 36,904  
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 1,815,048 591,945 538,756
FCC Licenses, Accumulated Impairment (47,410) (49,421) (49,421)
FCC Licenses, Net 1,767,638 542,524 $ 489,335
FCC Licenses Acquisitions, Gross 1,244,386 53,189  
FCC Licenses Acquisitions and Consolidations of VIEs, Net 1,244,386 $ 53,189  
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)