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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Carrying amount:    
Total carrying amount $ 360,767 $ 355,013
Accumulated amortization:    
Total accumulated amortization (101,067) (86,253)
Net amortizable intangible assets 259,700 268,760
Total other intangible assets 416,915 425,975
Indefinite-lived intangible assets - FCC licenses    
Accumulated amortization:    
Indefinite-lived intangible assets — FCC licenses 157,215 157,215
Television network affiliation relationships    
Carrying amount:    
Total carrying amount 248,444 248,444
Accumulated amortization:    
Total accumulated amortization (55,830) (49,639)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 69,500 69,500
Accumulated amortization:    
Total accumulated amortization (28,255) (26,345)
Other    
Carrying amount:    
Total carrying amount 42,823 37,069
Accumulated amortization:    
Total accumulated amortization $ (16,982) $ (10,269)