Leases - Lease Expense Narrative (Details) $ in Millions			3 Months Ended
	Sep. 06, 2021 route $ / d	Dec. 22, 2020	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items]
Cash paid on operating leases | $			$ 5.8	$ 3.4
Weighted average remaining lease term (in months)			12 years 4 months 24 days
2021 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Charters agreement term		12 months
2021 Built Ultramax Vessel | Twelve To Fifteen Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)	11,250
Vessel hire rate (usd per day)	57.50%
Number of routes | route	10
2021 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)	10,750
Minimum
Lessee, Lease, Description [Line Items]
Charters agreement term	12 months
Minimum | 2021 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Charters agreement term	12 months
Maximum
Lessee, Lease, Description [Line Items]
Charters agreement term	15 months
Maximum | 2021 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Charters agreement term	15 months