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Fair value measurement (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
Fair value measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment and other	$ 0	$ 3,400	$ (159)		$ 3,359	$ (322)
MadHive Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pre-tax gain on sale of equity method investment	25,800
Level 3 \| One Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of other equity investments				$ 2,500
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of total long-term debt	$ 2,740,000				$ 2,740,000		$ 2,950,000