Basis of Presentation and General Information (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	May 10, 2017 USD ($) t $ / d	Apr. 28, 2017 t $ / d	Oct. 31, 2014 t	Sep. 30, 2017 USD ($) vessel t $ / shares shares	Sep. 30, 2016 $ / shares shares	Sep. 30, 2017 USD ($) segment vessel t $ / shares shares	Sep. 30, 2016 $ / shares shares
Property, Plant and Equipment [Line Items]
Number of business segments | segment						1
Vessels in operation | vessel				48		48
Dead weight tonnage of operating fleet | t				2,737,100		2,737,100
Average age of operating fleet (in years)						8 years
Weighted Average Shares - Basic (in shares) | shares				70,329,252	29,607,639	68,782,517	11,318,249
Basic loss per share (in dollars per share)				$ 0.15	$ 0.65	$ 0.40	$ 7.17
Diluted loss per share (in dollars per share)				$ 0.15	$ 0.65	$ 0.40	$ 7.17
Japanese Vessel
Property, Plant and Equipment [Line Items]
Dead weight tonnage of operating fleet | t			37,000
Charters agreement term			7 years
Charters agreement term, extension option			1 year
Vessel agreement, termination fee | $	$ 1.5			$ 1.5		$ 1.5
2013 Built Japanese Vessel
Property, Plant and Equipment [Line Items]
Dead weight tonnage of operating fleet | t	61,400	61,400
Charters agreement term	4 years	4 years
Charters agreement term, extension option	2 years	2 years
Vessel hiring rate (in dollars per day) | $ / d		12,800
2013 Built Japanese Vessel | Fifth Year Option
Property, Plant and Equipment [Line Items]
Vessel hiring rate (in dollars per day) | $ / d	13,800
2013 Built Japanese Vessel | Sixth Year Option
Property, Plant and Equipment [Line Items]
Vessel hiring rate (in dollars per day) | $ / d	14,300
Supramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation | vessel				37		37
Ultramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation | vessel				11		11
Previously Reported
Property, Plant and Equipment [Line Items]
Weighted Average Shares - Basic (in shares) | shares					37,031,096		20,588,612
Basic loss per share (in dollars per share)					$ 0.52		$ 3.94
Diluted loss per share (in dollars per share)					$ 0.52		$ 3.94