General Information (Details)	12 Months Ended
	Dec. 31, 2019 vessel segment t
Property, Plant and Equipment [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Number of vessels	50
Carrying capacity (in dead weight tonnage) | t	2,946,188
Average age of operating fleet	8 years 8 months 12 days
Supramax Vessels
Property, Plant and Equipment [Line Items]
Vessels owned and operated	30
Ultramax Vessels
Property, Plant and Equipment [Line Items]
Vessels owned and operated	20
Vessels chartered in	3
Ultramax Vessels | Minimum
Property, Plant and Equipment [Line Items]
Term of charter agreement	1 year
Ultramax Vessels | Maximum
Property, Plant and Equipment [Line Items]
Term of charter agreement	2 years