Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 74,206	$ 83,550	$ 172,542	$ 177,014
Operating expenses:
Voyage expenses	41,695	41,800	90,063	84,822
Vessel operating expenses	21,058	24,358	42,871	47,549
Charter hire expenses	1,432	4,849	4,507	7,267
General and administrative expenses (inclusive of nonvested stock amortization expense of $476, $569, $957 and $1,021, respectively)	5,471	5,799	11,238	12,109
Technical management fees	1,724	1,885	3,578	3,825
Depreciation and amortization	15,930	18,271	33,504	36,348
Impairment of vessel assets	0	13,897	112,814	13,897
Loss (gain) on sale of vessels			486	(611)
Total operating expenses	87,310	110,859	299,061	205,206
Operating loss	(13,104)	(27,309)	(126,519)	(28,192)
Other (expense) income:
Other income (expense)	120	107	(464)	437
Interest income	253	1,073	847	2,400
Interest expense	(5,473)	(8,124)	(12,418)	(16,699)
Impairment of right-of-use asset		(223)		(223)
Other expense	(5,100)	(7,167)	(12,035)	(14,085)
Net loss	$ (18,204)	$ (34,476)	$ (138,554)	$ (42,277)
Net loss per share-basic	$ (0.43)	$ (0.83)	$ (3.31)	$ (1.01)
Net loss per share-diluted	$ (0.43)	$ (0.83)	$ (3.31)	$ (1.01)
Weighted average common shares outstanding-basic	41,900,901	41,742,301	41,883,629	41,734,248
Weighted average common shares outstanding-diluted	41,900,901	41,742,301	41,883,629	41,734,248
Voyage
Revenues:
Revenues	$ 74,206	$ 83,550	$ 172,542	$ 177,014