Concentrations of risk and geographic information - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Revenue	$ 1,005,459	$ 1,093,541	$ 1,161,084
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	388,000	446,000	$ 526,500
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Assets, Noncurrent	$ 1,600	$ 4,000