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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Carrying amount:    
Total carrying amount $ 362,242 $ 355,013
Accumulated amortization:    
Total accumulated amortization (108,038) (86,253)
Net amortizable intangible assets 254,204 268,760
Total other intangible assets 411,419 425,975
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 (58,925) (49,639)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 69,500 69,500
Accumulated amortization:    
Total accumulated amortization (34,010) (26,345)
Other    
Carrying amount:    
Total carrying amount 44,298 37,069
Accumulated amortization:    
Total accumulated amortization $ (15,103) $ (10,269)