Leases - Time Charter-In Contracts Narrative (Details) $ in Thousands												3 Months Ended	6 Months Ended	9 Months Ended
	Jun. 16, 2022 $ / d	May 17, 2022 route $ / d	Sep. 06, 2021 route $ / d	Jul. 08, 2021 $ / d	Jun. 28, 2021 $ / d	May 04, 2021 $ / d	Dec. 22, 2020 route t $ / d	Dec. 25, 2019 $ / d	Dec. 09, 2018 t $ / d	May 04, 2018 t $ / d	Apr. 28, 2017 t $ / d	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($) t	Sep. 30, 2021 USD ($)	Mar. 17, 2022	Dec. 31, 2021 USD ($)	Jul. 07, 2021	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t													3,190,000
Fair value below contract value of time charters acquired | $																				$ 1,800
Increase to lease modification liability | $																		$ 1,000	$ 4,500
Increase to lease modification right-of-use asset | $																		$ 1,000	$ 4,500
Total lease liabilities | $													$ 35,363
Operating lease right-of-use assets | $													35,370			$ 17,017
Chartered-in contracts greater than 12 months
Lessee, Lease, Description [Line Items]
Total lease liabilities | $													33,281
Operating lease right-of-use assets | $													33,281			$ 15,039
2013 Built Japanese Vessel
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t											61,400
Charters agreement term											4 years
Charters agreement term, extension option											2 years
Increase to lease liability and the corresponding right-of-use asset | $													5,100	$ 5,000
Discount rate	7.15%			1.36%
2013 Built Japanese Vessel | First Four Years
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d	14,300										12,800
2013 Built Japanese Vessel | First Optional Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d				13,800							13,800
2013 Built Japanese Vessel | Second Optional Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d											14,300
2013 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t										61,425
Charters agreement term										3 years
Charters agreement term, extension option										2 years
Increase to lease liability and the corresponding right-of-use asset | $														5,800
2013 Built Ultramax Vessel | First Optional Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d										13,750
2013 Built Ultramax Vessel | Second Optional Year
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d					13,750					14,750
Discount rate					1.34%
2013 Built Ultramax Vessel | First Three Years
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d										12,700
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 Two Years
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d								11,600	14,250
2016 Built Ultramax Vessel | Third Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d									15,250
2016 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d						12,600
Increase to lease liability and the corresponding right-of-use asset | $												$ 6,900		4,300
Discount rate						1.38%									4.48%
2021 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Dead weight tonnage of operating fleet | t							63,634
Charters agreement term							12 months
Charters agreement term, extension option							3 months
Discount rate		5.825%															1.33%
Charter agreement term, initial period							15 months
Total lease liabilities | $													9,700	9,100
Operating lease right-of-use assets | $													9,700	$ 9,100
2021 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d			10,750
2021 Built Ultramax Vessel | Twelve Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d							5,900
Vessel hire rate (usd per day)							57.00%
Number of routes | route							10
2021 Built Ultramax Vessel | Three Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d							6,500
Shared scrubber benefit							50.00%
2021 Built Ultramax Vessel | Twelve To Fifteen Month Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d			11,250
Vessel hire rate (usd per day)			57.50%
Number of routes | route			10
2021 Built Ultramax Vessel | Eleven Month Option
Lessee, Lease, Description [Line Items]
Charters agreement term, extension option		11 months
Vessel hiring rate (in dollars per day) | $ / d		6,500
Discount rate		5.825%
Vessel hire rate (usd per day)		57.00%
Number of routes | route		10
Total lease liabilities | $													7,500
Operating lease right-of-use assets | $													$ 7,500
Minimum
Lessee, Lease, Description [Line Items]
Charters agreement term			12 months
Charters agreement term, extension option							11 months
Minimum | 2016 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Operating lease, term of contract															10 months
Operating lease, renewal term															10 months
Maximum
Lessee, Lease, Description [Line Items]
Charters agreement term			15 months
Charters agreement term, extension option							13 months
Maximum | 2016 Built Ultramax Vessel
Lessee, Lease, Description [Line Items]
Operating lease, term of contract															12 months
Operating lease, renewal term															12 months