Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues, net	$ 57,391,784	$ 69,391,315	$ 131,770,103	$ 146,780,912
Voyage expenses	23,767,747	20,907,155	50,332,105	46,813,295
Vessel expenses	20,232,274	19,958,408	43,932,383	40,052,114
Charter hire expenses	4,719,367	11,179,480	10,760,306	22,671,386
Depreciation and amortization	12,503,191	9,761,322	24,969,674	19,168,430
General and administrative expenses	6,767,403	8,040,811	14,728,475	16,450,730
Operating lease impairment	352,368	0	352,368	0
Gain on sale of vessels	0	(966,802)	0	(5,073,349)
Total operating expenses	68,342,350	68,880,374	145,075,311	140,082,606
Operating (loss)/income	(10,950,566)	510,941	(13,305,208)	6,698,306
Interest expense	8,737,079	6,733,156	17,928,894	13,495,159
Interest income	(56,132)	(393,164)	(212,989)	(827,482)
Loss on debt extinguishment	0	0	0	2,268,452
Realized and unrealized loss/(gain) on derivative instruments, net	859,814	163,105	(7,002,027)	(2,275,150)
Total other expense, net	9,540,761	6,503,097	10,713,878	12,660,979
Net loss	$ (20,491,327)	$ (5,992,156)	$ (24,019,086)	$ (5,962,673)
Weighted average shares outstanding:
Basic (in shares)	71,945,621	71,348,524	71,907,387	71,316,093
Diluted (in shares)	71,945,621	71,348,524	71,907,387	71,316,093
Per share amounts:
Basic net loss (in usd per share)	$ (0.28)	$ (0.08)	$ (0.33)	$ (0.08)
Diluted net loss (in usd per share)	$ (0.28)	$ (0.08)	$ (0.33)	$ (0.08)