Accounting policies - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
Mar. 31, 2020	Dec. 31, 2020 USD ($) station	Jun. 30, 2021 USD ($) radioStation market segment station
Accounting Policies [Abstract]
Number of operating segments			1
Number of reportable segments			1
Number of television stations \| station		1	64
Number of radio stations		1	2
Number of markets In which entity operates \| market			51
Allowance for doubtful accounts receivable \| $		$ 7,035	$ 6,845
Commercial reselling agreement, term	3 years

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

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