Leases - Time Charter-In Contracts Narrative (Details) $ in Thousands													3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 15, 2022 $ / d	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 ($)	Jun. 30, 2022 USD ($)	Sep. 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															3,140,000
Fair value below contract value of time charters acquired | $																						$ 1,800
Increase to lease liability and the corresponding right-of-use asset | $															$ 38,956	$ 22,499
Increase to lease modification liability | $																				$ 1,000	$ 4,500
Increase to lease modification right-of-use asset | $																				$ 1,000	$ 4,500
Total lease liabilities | $															34,368
Operating lease right-of-use assets | $															34,368			$ 17,017
Chartered-in contracts greater than 12 months
Lessee, Lease, Description [Line Items]
Total lease liabilities | $															30,282
Operating lease right-of-use assets | $															30,281			$ 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 | $															$ 4,500	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	14,750										12,700
2013 Built Ultramax Vessel | Additional Year Option
Lessee, Lease, Description [Line Items]
Discount rate	6.54%
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										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%
2016 Built Ultramax Vessel | One Year Option
Lessee, Lease, Description [Line Items]
Vessel hiring rate (in dollars per day) | $ / d									11,600
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%												8.97%				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