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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Carrying amount:    
Total carrying amount $ 1,419,736 $ 823,589
Accumulated amortization:    
Total accumulated amortization (212,539) (204,960)
Net amortizable intangible assets 1,207,197 618,629
Indefinite-lived intangible assets — FCC licenses 790,515 356,815
Total other intangible assets 1,997,712 975,444
Television affiliation relationships    
Carrying amount:    
Total carrying amount 1,074,244 616,244
Accumulated amortization:    
Total accumulated amortization (127,490) (113,950)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 213,400 102,900
Accumulated amortization:    
Total accumulated amortization (53,871) (53,232)
Other    
Carrying amount:    
Total carrying amount 132,092 104,445
Accumulated amortization:    
Total accumulated amortization $ (31,178) $ (37,778)