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Goodwill and intangible assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 831,010 $ 852,152
Accumulated amortization 617,967 588,481
Net carrying amount 213,043 263,671
Indefinite-lived intangible assets:    
Total intangible assets 377,416 430,374
Goodwill 519,035 530,028
Mastheads    
Indefinite-lived intangible assets:    
Non-amortized intangible assets 164,373 166,703
Advertiser relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 435,226 445,356
Accumulated amortization 295,713 279,176
Net carrying amount 139,513 166,180
Other customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 88,636 89,106
Accumulated amortization 63,328 59,198
Net carrying amount 25,308 29,908
Subscriber relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 240,278 250,820
Accumulated amortization 192,161 183,895
Net carrying amount 48,117 66,925
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 66,870 66,870
Accumulated amortization 66,765 66,212
Net carrying amount $ 105 $ 658