Goodwill and other intangible assets - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 2,981,587	$ 2,981,587
Accumulated Amortization	0	0
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	(276,780)	(348,087)
Total indefinite-lived and amortizable intangible assets	2,619,045	2,729,693
Television and radio station FCC broadcast licenses
Indefinite-lived Intangible Assets [Line Items]
Television and radio station FCC broadcast licenses	2,124,731	2,123,898
Retransmission agreements
Finite-Lived Intangible Assets [Line Items]
Gross	113,621	224,827
Accumulated Amortization	(90,183)	(184,796)
Network affiliation agreements
Finite-Lived Intangible Assets [Line Items]
Gross	309,503	309,503
Accumulated Amortization	(139,042)	(121,664)
Other
Finite-Lived Intangible Assets [Line Items]
Gross	71,190	71,465
Accumulated Amortization	$ (47,555)	$ (41,627)