EARNINGS PER SHARE/UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2018	May 31, 2018	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net loss	$ (538)		$ 34,267	$ (9,760)							$ 23,969
Net income (loss) available to common stockholders/limited partners											$ 23,969
Percentage of general partnership interest		2.00%			2.00%					2.00%		2.00%	2.00%
Weighted average limited partner units outstanding:
Weighted average common shares/units outstanding, basic											10,030,000
Dilutive effect of potential common shares/units											2,000
Weighted average common shares/units outstanding, diluted											10,032,000
Basic and diluted earnings per share / unit:
Basic, share/unit	$ (0.05)		$ 3.41	$ (0.97)							$ 2.39
Diluted, share/unit	$ (0.05)		$ 3.41	$ (0.97)							$ 2.39
Equity awards not included in computation of diluted net income (loss) per limited partner unit											800,000
Predecessor
Net loss		$ (595,076)			$ (15,449)	$ (40,321)	$ (17,888)	$ (25,161)	$ (50,831)	$ (610,525)		$ (134,201)	$ (242,895)
General partner's 2% interest in net income (loss)										12,211		2,684	4,858
Net income (loss) available to common stockholders/limited partners										$ (598,314)		$ (131,517)	$ (238,037)
Earnings per limited partner unit basic						$ (0.80)	$ (0.36)	$ (0.50)	$ (1.01)
Diluted, unit						(0.80)	(0.36)	(0.50)	(1.01)
Percentage of general partnership interest												2.00%
Weighted average limited partner units outstanding:
Weighted average common shares/units outstanding, basic										49,369,000		49,357,000	49,048,000
Weighted average common shares/units outstanding, diluted										49,369,000		49,357,000	49,048,000
Basic and diluted earnings per share / unit:
Basic, share/unit		$ (11.81)			$ (0.31)					$ (12.12)		$ (2.66)	$ (4.85)
Basic, unit						(0.80)	(0.36)	(0.50)	(1.01)
Diluted, share/unit		$ (11.81)			$ (0.31)					$ (12.12)		$ (2.66)	$ (4.85)
Diluted, unit						$ (0.80)	$ (0.36)	$ (0.50)	$ (1.01)