Leases - Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 7,182	$ 23,006
Current portion of operating lease liabilities	6,153	22,045
Noncurrent portion of operating lease liabilities	2,576	3,173
Time charter-in contracts greater than 12 months
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	4,810	19,116
Current portion of operating lease liabilities	5,405	21,328
Noncurrent portion of operating lease liabilities	$ 0	$ 0
Weighted average remaining lease term (in years)	4 months 24 days	7 months 6 days
Weighted average discount rate	6.60%	6.00%
Office leases
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 2,372	$ 3,890
Current portion of operating lease liabilities	748	717
Noncurrent portion of operating lease liabilities	$ 2,576	$ 3,173
Weighted average remaining lease term (in years)	4 years 4 months 24 days	4 years 8 months 12 days
Weighted average discount rate	7.20%	6.90%