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Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying amount:    
Total carrying amount $ 823,589 $ 823,500
Accumulated amortization:    
Total accumulated amortization (204,960) (148,740)
Net amortizable intangible assets 618,629 674,760
Total other intangible assets 975,444 1,060,675
FCC licenses    
Accumulated amortization:    
Other indefinite-lived intangible assets - FCC licenses 356,815 385,915
Television network affiliation relationships    
Carrying amount:    
Total carrying amount 616,244 616,244
Accumulated amortization:    
Total accumulated amortization (113,950) (82,917)
Customer lists and advertiser relationships    
Carrying amount:    
Total carrying amount 102,900 104,300
Accumulated amortization:    
Total accumulated amortization (53,232) (42,012)
Other intangible assets    
Carrying amount:    
Total carrying amount 104,445 102,956
Accumulated amortization:    
Total accumulated amortization $ (37,778) $ (23,811)