Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 35,370	$ 17,017
Lease liabilities - short term	29,908	15,728
Lease liabilities - long term	$ 5,455	$ 1,282
Minimum
Lessee, Lease, Description [Line Items]
Discount rate	1.33%	1.33%
Maximum
Lessee, Lease, Description [Line Items]
Discount rate	7.15%	7.15%
Weighted Average
Lessee, Lease, Description [Line Items]
Discount rate	499.00%	499.00%
Chartered-in contracts greater than 12 months
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 33,281	$ 15,039
Lease liabilities - short term	29,112	15,039
Lease liabilities - long term	4,169	0
Office leases
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	2,089	1,978
Lease liabilities - short term	796	689
Lease liabilities - long term	$ 1,286	$ 1,282