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Acquisitions and Dispositions - Reiten - Additional Information (Details)
$ in Thousands
3 Months Ended 11 Months Ended 12 Months Ended
Feb. 01, 2016
USD ($)
TelevisionStation
Sep. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                            
Net revenue     $ 309,879 $ 275,659 $ 261,994 $ 255,658 $ 252,262 $ 223,031 $ 219,349 $ 201,735   $ 1,103,190 $ 896,377 $ 631,311
Operating income (loss)     $ 92,475 $ 72,897 $ 64,007 $ 57,929 $ 67,346 $ 48,315 $ 52,542 $ 37,904   $ 287,308 $ 206,107 $ 173,237
Network affiliation agreements [Member]                            
Business Acquisition [Line Items]                            
Network affiliation agreements useful life                       15 years 15 years 15 years
Reiten [Member]                            
Business Acquisition [Line Items]                            
Acquisition date Feb. 01, 2016                          
Number of television stations acquired | TelevisionStation 4                          
Purchase price of entities acquired $ 44,000                          
Deposit paid upon signing an agreement to acquire a business   $ 2,200                        
Acquisition related costs                       $ 100    
Net revenue                     $ 11,100      
Operating income (loss)                     $ 1,000      
Reiten [Member] | Network affiliation agreements [Member]                            
Business Acquisition [Line Items]                            
Network affiliation agreements useful life 15 years                          
Reiten [Member] | Other definite-lived intangible assets [Member]                            
Business Acquisition [Line Items]                            
Weighted average estimated useful life of other intangible assets 2 years 6 months