Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues, net	$ 310,094,258	$ 236,784,625	$ 124,492,844
Voyage expenses	79,566,452	62,351,252	42,093,714
Vessel expenses	81,336,260	78,607,244	74,016,763
Charter hire expenses	38,045,778	31,283,956	12,845,468
Depreciation and amortization	37,717,462	33,690,686	38,884,322
General and administrative expenses	36,156,660	33,126,310	22,905,802
Restructuring charges	0	0	5,869,025
(Gain)/loss on sale of vessels	(335,160)	(2,134,767)	101,860
Vessel impairment	0	0	129,027,862
Total operating expenses	272,487,452	236,924,681	325,744,816
Operating income/(loss)	37,606,806	(140,056)	(201,251,972)
Interest expense	25,743,531	29,376,994	21,799,146
Interest expense	(585,168)	(651,069)	(215,433)
Other (income)/expense	(126,241)	(37,905)	686,750
Loss on debt extinguishment	0	14,968,609	0
Total other expense, net	25,032,122	43,656,629	22,270,463
Net income/(loss)	$ 12,574,684	$ (43,796,685)	$ (223,522,435)
Weighted average shares outstanding:
Basic (in shares)	70,665,212	69,182,302	20,565,652
Diluted (in shares)	71,802,173	69,182,302	20,565,652
Per share amounts:
Basic income/(loss) (in dollars per share)	$ 0.18	$ (0.63)	$ (10.87)
Diluted net income/(loss) (in dollars per share)	$ 0.18	$ (0.63)	$ (10.87)