Leases - Schedule of Finance lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
External leases:
Finance lease liabilities	$ 240,852	$ 251,658
Less current portion of finance lease liabilities	(20,643)	(21,903)
Finance lease liabilities, long-term	220,209	229,755
Related party leases:
Finance lease liabilities		226,619
Less current portion of finance lease liabilities	0	(15,627)
Finance lease liabilities, long-term	$ 0	$ 210,992