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Basis of presentation, merger agreement and accounting policies - Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Total revenues $ 740,327 $ 774,123
Subscription    
Disaggregation of Revenue [Line Items]    
Total revenues 414,280 391,654
Advertising & Marketing Services    
Disaggregation of Revenue [Line Items]    
Total revenues 307,845 354,467
Political    
Disaggregation of Revenue [Line Items]    
Total revenues 5,291 17,965
Other    
Disaggregation of Revenue [Line Items]    
Total revenues $ 12,911 $ 10,037