Lease costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Short-term lease cost	$ 132,449	$ 135,376
Operating lease cost	46,622	45,319
Variable lease cost	1,516	1,319
Total lease costs	$ 180,587	$ 182,014
Weighted average remaining lease term	2 years 8 months 1 day	2 years 8 months 23 days
Weighted average discount rate	3.54%	4.03%
Cash paid for amounts included in the measurement of lease liabilities	$ 43,489	$ 45,043