LONG-TERM DEFERRED REVENUE LIABILITIES AND OTHER LONG-TERM LIABILITIES - Narrative (Details) $ in Thousands			1 Months Ended	3 Months Ended	9 Months Ended
	May 08, 2020 USD ($)	May 21, 2018 USD ($)	Jul. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 11, 2019 USD ($) bbl	Jul. 31, 2018 well mi
Long-term Purchase Commitment [Line Items]
Deferred revenue		$ 35,000
Deferred revenue recognized						$ 11,700
Contract with customer, term		12 years
Date Of Settlement			Oct. 12, 2020
Winkler Lea Transactions
Long-term Purchase Commitment [Line Items]
Proceeds from sale of overriding royalty interests and non-operated working interests			$ 39,000
Net revenue payments on financing arrangement				$ 700	$ 2,500
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
Prefunded drilling bonus							$ 2,500
Crude oil takeaway, target number of barrels per day (in barrels per day) | bbl							40,000
Deferred revenue							$ 2,500
Deferred revenue recognized	$ 2,200				$ 100