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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying amount:    
Total carrying amount $ 1,407,909 $ 823,589
Accumulated amortization:    
Total accumulated amortization (278,613) (204,960)
Net amortizable intangible assets 1,129,296 618,629
Total other intangible assets 1,910,311 975,444
FCC licenses    
Accumulated amortization:    
Other indefinite-lived intangible assets - FCC licenses 781,015 356,815
Other affiliation relationships    
Carrying amount:    
Total carrying amount 1,060,244 616,244
Accumulated amortization:    
Total accumulated amortization (168,021) (113,950)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 217,400 102,900
Accumulated amortization:    
Total accumulated amortization (77,711) (53,232)
Other intangible assets    
Carrying amount:    
Total carrying amount 130,265 104,445
Accumulated amortization:    
Total accumulated amortization $ (32,881) $ (37,778)