Basis of presentation, terminated merger agreement and accounting policies - Narrative (Details) $ in Thousands, shares in Millions			3 Months Ended			9 Months Ended
	Jun. 01, 2023 shares	May 22, 2023 USD ($)	Sep. 30, 2023 USD ($) market	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) station segment radioStation market	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of operating segments | segment						1
Number of reportable segments | segment						1
Number of television stations | station						64
Number of radio stations | radioStation						2
Number of markets in which entity operates | market			51			51
Allowance for doubtful accounts receivable			$ 4,492			$ 4,492		$ 3,697
Asset impairment and other			$ 0	$ 3,400	$ (159)	$ 3,359	$ (322)
Teton Parent Corp
Disaggregation of Revenue [Line Items]
Termination fee		$ 136,000		$ 136,000
Termination fee paid in shares (in shares) | shares	8.6
Teton Parent Corp | Advisor
Disaggregation of Revenue [Line Items]
Termination fee		$ 9,900