Leases - Components of lease expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Leases
Operating lease cost	$ 15,075	$ 41,226	$ 43,007	$ 81,602
Short-term lease cost	46,080	25,659	77,299	41,989
Amortization of right-of-use assets	8,612	8,619	17,224	21,084
Interest on lease liabilities	1,332	2,234	2,896	4,768
Total finance lease cost	9,944	10,853	20,120	25,852
Total lease costs	$ 71,099	$ 77,738	$ 140,426	$ 149,443