Components of total lease cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee Disclosure [Abstract]
Operating lease cost	$ 12,825	$ 17,980
Short-term lease cost	145,052	143,892
Variable lease cost	48,931	70,858
Total lease cost	206,808	232,730
Operating cash flows from operating leases	11,286	12,046
Investing cash flows from operating leases	$ 2,316	$ 7,313