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Goodwill and intangible assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 853,715 | $ 868,307
Accumulated amortization | 568,213 | 510,833
Net carrying amount | 285,502 | 357,474
Indefinite-lived intangible assets: |  |
Total intangible assets | 453,052 | 524,350
Goodwill | 531,112 | 533,876
Mastheads |  |
Indefinite-lived intangible assets: |  |
Non-amortized intangible assets | 167,550 | 166,876
Advertiser relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 446,801 | 446,609
Accumulated amortization | 269,058 | 236,168
Net carrying amount | 177,743 | 210,441
Other customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 89,204 | 101,819
Accumulated amortization | 57,016 | 56,601
Net carrying amount | 32,188 | 45,218
Subscriber relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 250,840 | 251,099
Accumulated amortization | 176,736 | 155,528
Net carrying amount | 74,104 | 95,571
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 66,870 | 68,780
Accumulated amortization | 65,403 | 62,536
Net carrying amount | $ 1,467 | $ 6,244

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