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UNAUDITED QUARTERLY RESULTS OF OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
UNAUDITED QUARTERLY RESULTS OF OPERATIONS
Revenues	$ 112,185	$ 92,263	$ 86,157	$ 76,916	$ 74,918	$ 51,161	$ 45,370	$ 38,249	$ 367,522	$ 209,698	$ 135,586
Operating (loss) income	25,972	12,089	10,851	(48,398)	9,973	(23,782)	(7,237)	(8,570)	516	(29,615)	(186,476)
Net (loss) income	$ 18,283	$ 5,708	$ (1,120)	$ (55,813)	$ 2,569	$ (31,182)	$ (14,513)	$ (15,600)	$ (32,940)	$ (58,725)	$ (217,757)
Net (loss) earnings per share - basic (1)	$ 0.44	$ 0.14	$ (0.03)	$ (1.61)	$ 0.07	$ (0.90)	$ (0.42)	$ (0.47)	$ (0.86)	$ (1.71)	$ (30.03)
Net (loss) earnings per share - diluted (1)	$ 0.44	$ 0.14	$ (0.03)	$ (1.61)	$ 0.07	$ (0.90)	$ (0.42)	$ (0.47)	$ (0.86)	$ (1.71)	$ (30.03)
Weighted average common shares outstanding - Basic (in shares)	41,704,296	41,618,187	35,516,058	34,577,990	34,559,830	34,469,998	34,430,766	33,495,738	38,382,599	34,242,631	7,251,231
Weighted average common shares outstanding - diluted	41,792,956	41,821,008	35,516,058	34,577,990	34,682,302	34,469,998	34,430,766	33,495,738	38,382,599	34,242,631	7,251,231

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