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Summary of significant accounting policies - Concentration Risk (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 2,302,226 $ 2,509,315 $ 2,663,550
U.K. | Newsquest      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 238,300    
Foreign Countries | Newsquest      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 162,000    
Foreign Countries | LocaliQ      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 42,200    
Long-lived assets $ 2,400