LONG-TERM DEFERRED REVENUE LIABILITIES AND OTHER LONG-TERM LIABILITIES - Narrative (Details) $ in Millions					1 Months Ended	3 Months Ended
	Jul. 31, 2019 USD ($)	Mar. 07, 2019 USD ($)	Jul. 25, 2018 USD ($)	May 21, 2018 USD ($)	Jul. 31, 2018 USD ($) well bbl mi	Dec. 31, 2019 USD ($)	Mar. 11, 2019 USD ($) bbl	Oct. 01, 2018 USD ($)
Long-term Purchase Commitment [Line Items]
Deferred revenue				$ 35.0
Contract with customer, term				12 years
Salt Creek Midstream Water, LLC
Long-term Purchase Commitment [Line Items]
Number of miles of pipeline (in miles) | mi					14
Number of wells (in wells) | well					1
Upfront non-refundable payment		$ 11.7	$ 10.0
Total purchase price					$ 20.0
Prefunded drilling bonus			$ 5.0		$ 2.5		$ 2.5	$ 2.5
Crude oil takeaway, target number of barrels per day (in barrels per day) | bbl					40,000		40,000
Deferred revenue							$ 2.5
Winkler Lea Transactions
Long-term Purchase Commitment [Line Items]
Proceeds from sale of overriding royalty interests and non-operated working interests	$ 39.0
Net revenue payments on financing arrangement						$ 0.9