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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying amount:    
Total carrying amount $ 1,404,868 $ 823,589
Accumulated amortization:    
Total accumulated amortization (254,083) (204,960)
Net amortizable intangible assets 1,150,785 618,629
Indefinite-lived intangible assets — FCC licenses 781,015 356,815
Total other intangible assets 1,931,800 975,444
Television affiliation relationships    
Carrying amount:    
Total carrying amount 1,060,244 616,244
Accumulated amortization:    
Total accumulated amortization (154,503) (113,950)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 217,400 102,900
Accumulated amortization:    
Total accumulated amortization (70,350) (53,232)
Other    
Carrying amount:    
Total carrying amount 127,224 104,445
Accumulated amortization:    
Total accumulated amortization $ (29,230) $ (37,778)