ASSET RETIREMENT OBLIGATIONS - Changes in Asset Retirement Obligations (Details) - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		$ 290,067
Liabilities incurred		2,280
Liabilities settled		(81,197)
Divestment of properties		0
Accretion expense		21,151
Revision of estimates		(19,200)
Fair value fresh start adjustment		0
Asset retirement obligations, end of period	$ 290,067	213,101
Predecessor
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	242,019	$ 290,067	$ 225,866	$ 316,409
Liabilities incurred	0		2,338	15,933
Liabilities settled	(3,641)		(19,630)	(72,713)
Divestment of properties	(8,672)		0	(248)
Accretion expense	5,447		40,229	25,988
Revision of estimates	0		(6,784)	(59,503)
Fair value fresh start adjustment	54,914		0	0
Asset retirement obligations, end of period	$ 290,067		$ 242,019	$ 225,866