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Accounting policies - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 22, 2022 USD ($) $ / shares | Mar. 31, 2020 | Jun. 30, 2022 USD ($) radioStation market segment station $ / shares | Dec. 31, 2021 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 | $ |  |  | $ 5,564 | $ 4,371
Commercial reselling agreement, term |  | 3 years |  |
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 |  |  |
Termination fee | $ | $ 163,000 |  |  |
Teton Parent Corp | Closing between 9- and 12-month anniversary of signing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Ticking fee, per day (dollars per share) | $ 0.00167 |  |  |
Ticking fee, per month (dollars per share) | 0.05 |  |  |
Teton Parent Corp | Closing between 12- and 13-month anniversary of signing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Ticking fee, per day (dollars per share) | 0.0025 |  |  |
Ticking fee, per month (dollars per share) | 0.075 |  |  |
Teton Parent Corp | Closing between 13- and 14-month anniversary of signing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Ticking fee, per day (dollars per share) | 0.00333 |  |  |
Ticking fee, per month (dollars per share) | 0.10 |  |  |
Teton Parent Corp | Closing after 14-month anniversary of signing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Ticking fee, per day (dollars per share) | 0.00417 |  |  |
Ticking fee, per month (dollars per share) | $ 0.125 |  |  |

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