Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Short-term lease cost
Total lease cost	$ 7,051	$ 19,988	$ 31,627	$ 64,393
Chartered In Contracts
Operating lease cost
Operating lease cost	4,457	8,013	17,277	20,451
Short-term lease cost
Short-term lease cost	2,411	11,759	13,737	43,317
Sublease income, gross
Sublease income, gross	7,282	8,402	20,442	25,072
Office leases
Operating lease cost
Operating lease cost	$ 183	$ 216	$ 613	$ 625