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Investments and other assets - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2022	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Other non-operating items, net		$ 1,310		$ 2,486	$ 16,764	$ 4,340
Proceeds from maturity of debt securities available for sale	$ 3,000
Impairment of other equity investments			$ 2,500
Commercial Agreement \| MadHive Inc \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Debt Securities, Available-for-sale [Line Items]
Amortization period		2 years			2 years
Reclassification out of Accumulated Other Comprehensive Income \| AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest
Debt Securities, Available-for-sale [Line Items]
Other non-operating items, net			$ 20,800