Basis of presentation and accounting policies - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) RadioStation Segment Market Station	Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Number of operating segments	1
Number of reportable segments	1
Number of television stations | Station	64
Number of radio stations | RadioStation	2
Number of markets in which entity operates | Market	51
Allowance for doubtful accounts receivable | $	$ 2,535	$ 2,845