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Investments and other assets - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Other non-operating items, net		$ (1,865)		$ 1,524	$ 15,454	$ 1,854
Proceeds from maturity of debt securities available for sale	$ 3,000
Impairment of other equity investments			$ 2,500
Long-term contract assets	22,253	22,253			22,253		$ 0
Service For IT Security
Debt Securities, Available-for-sale [Line Items]
Long-term contract assets	15,000	15,000			15,000
Commercial Agreement | MadHive Inc
Debt Securities, Available-for-sale [Line Items]
Long-term contract assets	$ 5,200	$ 5,200			$ 5,200
Commercial Agreement | MadHive Inc | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Debt Securities, Available-for-sale [Line Items]
Amortization period	2 years	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

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