DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Gains or Losses Related to Changes in Fair Value and Cash Settlements on Derivatives Not Qualifying as Hedging Instruments (Details) - Not Designated as Hedging Instrument - Commodity contracts - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Cash settlements		$ 2,161
Change in fair value		(15,549)
Total gain on non-qualifying derivatives		$ (13,388)
Predecessor
Derivatives, Fair Value [Line Items]
Cash settlements	$ 0		$ 0	$ 17,385
Change in fair value	(1,778)		0	(12,146)
Total gain on non-qualifying derivatives	$ (1,778)		$ 0	$ 5,239