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UNAUDITED QUARTERLY RESULTS OF OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNAUDITED QUARTERLY RESULTS OF OPERATIONS
Voyage revenues	$ 74,918	$ 51,161	$ 45,370	$ 38,249	$ 43,785	$ 37,871	$ 31,460	$ 20,131	$ 209,698	$ 133,246	$ 150,784
Operating (loss) income	9,973	(23,782)	(7,237)	(8,570)	(18,634)	(20,115)	(100,766)	(46,960)	(29,615)	(186,476)	(192,867)
Net (loss) income	$ 2,569	$ (31,182)	$ (14,513)	$ (15,600)	$ (25,104)	$ (27,514)	$ (110,653)	$ (54,483)	$ (58,725)	$ (217,757)	$ (254,368)
Net (loss) earnings per share - basic (1)	$ 0.07	$ (0.90)	$ (0.42)	$ (0.47)	$ (3.43)	$ (3.80)	$ (15.32)	$ (7.55)	$ (1.71)	$ (30.03)	$ (29.61)
Net (loss) earnings per share - diluted (1)	$ 0.07	$ (0.90)	$ (0.42)	$ (0.47)	$ (3.43)	$ (3.80)	$ (15.32)	$ (7.55)	$ (1.71)	$ (30.03)	$ (29.61)
Weighted average common shares outstanding - Basic (in shares)	34,559,830	34,469,998	34,430,766	33,495,738	7,318,452	7,245,268	7,221,735	7,218,795	34,242,631	7,251,231	6,583,163
Weighted average common shares outstanding - diluted	34,682,302	34,469,998	34,430,766	33,495,738	7,318,452	7,245,268	7,221,735	7,218,795	34,242,631	7,251,231	6,583,163

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