Basis of presentation, merger agreement and accounting policies - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 22, 2022 USD ($) $ / shares	Mar. 31, 2023 USD ($) segment station radioStation market $ / shares	Dec. 31, 2022 USD ($) $ / shares
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
Common stock, par value (in dollars per share)	$ 1.00	$ 1	$ 1
Allowance for doubtful accounts receivable | $		$ 3,965	$ 3,697
Business Combination Termination Scenario One | Teton Parent Corp
Disaggregation of Revenue [Line Items]
Termination fee | $	$ 136,000
Business Combination Termination Scenario Two | Teton Parent Corp
Disaggregation of Revenue [Line Items]
Termination fee | $	$ 272,000
Teton Parent Corp
Disaggregation of Revenue [Line Items]
Conversion price (in dollars per share)	$ 24.00
Teton Parent Corp | Closing Between November 22, 2022 and February 22, 2023
Disaggregation of Revenue [Line Items]
Ticking fee, per day ( in dollars per share)	0.00166667
Teton Parent Corp | Closing Between February 22, 2023 and March 22, 2023
Disaggregation of Revenue [Line Items]
Ticking fee, per day ( in dollars per share)	0.0025
Ticking fee, per month ( in dollars per share)	0.15333333
Teton Parent Corp | Closing Between March 22, 2023 and April 22, 2023
Disaggregation of Revenue [Line Items]
Ticking fee, per day ( in dollars per share)	0.00333333
Ticking fee, per month ( in dollars per share)	0.22333333
Teton Parent Corp | Closing Between April 22, 2023 and May 22, 2023
Disaggregation of Revenue [Line Items]
Ticking fee, per day ( in dollars per share)	0.00416667
Ticking fee, per month ( in dollars per share)	$ 0.3266667