Goodwill and Other Intangible Assets - Summary of other intangible assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying amount:
Total carrying amount	$ 1,415,103	$ 1,407,909
Accumulated amortization:
Total accumulated amortization	(302,989)	(278,613)
Net amortizable intangible assets	1,112,114	1,129,296
Indefinite-lived intangible assets — FCC licenses	781,015	781,015
Total other intangible assets	1,893,129	1,910,311
Television affiliation relationships
Carrying amount:
Total carrying amount	1,060,244	1,060,244
Accumulated amortization:
Total accumulated amortization	(181,539)	(168,021)
Customer lists and advertiser relationships
Carrying amount:
Total carrying amount	220,997	217,400
Accumulated amortization:
Total accumulated amortization	(85,252)	(77,711)
Other
Carrying amount:
Total carrying amount	133,862	130,265
Accumulated amortization:
Total accumulated amortization	$ (36,198)	$ (32,881)