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Goodwill and intangible assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 830,592 $ 852,152
Accumulated amortization 637,583 588,481
Net carrying amount 193,009 263,671
Indefinite-lived intangible assets:    
Total intangible assets 357,083 430,374
Goodwill 518,694 530,028
Mastheads    
Indefinite-lived intangible assets:    
Non-amortized intangible assets 164,074 166,703
Advertiser relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 434,850 445,356
Accumulated amortization 306,264 279,176
Net carrying amount 128,586 166,180
Other customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 88,601 89,106
Accumulated amortization 65,366 59,198
Net carrying amount 23,235 29,908
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 240,271 250,820
Accumulated amortization 199,152 183,895
Net carrying amount 41,119 66,925
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 66,870 66,870
Accumulated amortization 66,801 66,212
Net carrying amount $ 69 $ 658