Leases - Schedule of Finance lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
External leases:
Finance lease liabilities	$ 246,314	$ 251,658
Less current portion of finance lease liabilities	(21,278)	(21,903)
Finance lease liabilities, long-term	225,036	229,755
Related party leases:
Finance lease liabilities	223,707	226,619
Less current portion of finance lease liabilities	(17,118)	(15,627)
Finance lease liabilities, long-term	$ 206,589	$ 210,992