Goodwill and other intangible assets - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 3,015,973	$ 2,981,587
Accumulated Amortization	(257,433)	(289,949)
Total indefinite-lived and amortizable intangible assets	2,607,145	2,618,921
Retransmission agreements
Indefinite-lived Intangible Assets [Line Items]
Gross	101,423	113,621
Accumulated Amortization	(88,477)	(95,619)
Network affiliation agreements
Indefinite-lived Intangible Assets [Line Items]
Gross	275,524	309,502
Accumulated Amortization	(116,239)	(144,834)
Other
Indefinite-lived Intangible Assets [Line Items]
Gross	105,467	71,067
Accumulated Amortization	(52,717)	(49,496)
Television and radio station FCC broadcast licenses
Indefinite-lived Intangible Assets [Line Items]
Television and radio station FCC broadcast licenses	$ 2,124,731	$ 2,124,731