Leases - Narrative (Time Chart-Out and Charter-In) (Details)			1 Months Ended
	Feb. 28, 2023 $ / d	Oct. 17, 2018 $ / d	Aug. 31, 2023 $ / d	Mar. 31, 2023 $ / d	May 31, 2022	Mar. 31, 2022 $ / d	Sep. 30, 2021 t $ / d	Dec. 31, 2020 t $ / d	Dec. 31, 2019 $ / d	Oct. 31, 2018 t	Sep. 30, 2023 vessel t
Lessee, Lease, Description [Line Items]
Number of vessels charted-in | vessel											4
Dead weight tonnage of operating fleet | t											3,160,000
2016 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t										62,487
Charters agreement term										2 years
2016 Built Ultramax Vessel | First Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)		14,250				23,888			11,600
2016 Built Ultramax Vessel | Second Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)	25,888	15,250		17,500		25,888
2016 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)									12,600
2016 Built Ultramax Vessel | Third Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)				19,500
2021 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t							64,539	63,634
Charters agreement term				12 months			12 months	12 months
2021 Built Ultramax Vessel | Minimum
Lessee, Lease, Description [Line Items]
Charters agreement term			10 months		11 months			11 months
2021 Built Ultramax Vessel | Maximum
Lessee, Lease, Description [Line Items]
Charters agreement term			12 months		13 months			13 months
2021 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)							10,750
Vessel hire rate (usd per day)							57.50%
2021 Built Ultramax Vessel | Third Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)				9,500
Vessel hire rate (usd per day)				57.50%
2021 Built Ultramax Vessel | Three Month Option
Lessee, Lease, Description [Line Items]
Charters agreement term							3 months	3 months
Vessel hiring rate (in dollars per day)			6,300					5,900
Vessel hire rate (usd per day)								57.00%
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%
2021 Built Ultramax Vessel | Second Optional Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)				8,500
Vessel hire rate (usd per day)				57.50%
2021 Built Ultramax Vessel | Eleven To Thirteen Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)								6,500
Vessel hire rate (usd per day)			58.00%					57.00%
2021 Built Ultramax Vessel | Ten To Twelve Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day)			7,500
Vessel hire rate (usd per day)			58.00%