Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues, net	$ 62,710,903	$ 35,788,181	$ 162,197,184	$ 82,656,903
Voyage expenses	17,462,699	11,207,959	44,195,710	27,902,155
Vessel expenses	20,110,123	17,707,959	57,374,444	56,783,181
Charter hire expenses	9,652,468	3,822,456	19,971,380	6,979,213
Depreciation and amortization	8,980,992	9,854,228	24,494,397	28,905,058
General and administrative expenses	8,620,938	5,223,782	24,989,738	15,429,844
Refinancing expenses	0	(4,625)	0	5,869,025
Loss / (gain) on sale of vessels	(202,487)	(299,350)	(2,100,386)	101,860
Vessel impairment	0	0	0	6,167,262
Total operating expenses	64,624,733	47,512,409	168,925,283	148,137,598
Operating loss	(1,913,830)	(11,724,228)	(6,728,099)	(65,480,695)
Interest expense	7,836,999	7,434,156	21,140,746	15,154,659
Interest income	(142,940)	(88,094)	(518,379)	(91,606)
Other (income) / expense	647,457	288,754	(138,206)	589,539
Total other expense, net	8,341,516	7,634,816	20,484,161	15,652,592
Net loss	$ (10,255,346)	$ (19,359,044)	$ (27,212,260)	$ (81,133,287)
Weighted average shares outstanding:
Basic (in shares)	70,329,252	29,607,639	68,782,517	11,318,249
Diluted (in shares)	70,329,252	29,607,639	68,782,517	11,318,249
Per share amounts:
Basic net loss (in dollars per share)	$ (0.15)	$ (0.65)	$ (0.40)	$ (7.17)
Diluted net loss (in dollars per share)	$ (0.15)	$ (0.65)	$ (0.40)	$ (7.17)