Basis of presentation, merger agreement and accounting policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 731,506	$ 784,881	$ 1,471,833	$ 1,559,004
Subscription
Disaggregation of Revenue [Line Items]
Total revenues	396,126	389,079	810,406	780,733
Advertising & Marketing Services
Disaggregation of Revenue [Line Items]
Total revenues	317,726	335,259	625,571	689,726
Political
Disaggregation of Revenue [Line Items]
Total revenues	5,991	50,858	11,282	68,823
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,663	$ 9,685	$ 24,574	$ 19,722