RELATED PARTY TRANSACTIONS - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Total	$ (37,886)	$ (37,672)
Varde Partners, Inc.
Related Party Transaction [Line Items]
Payable for net proportionate share of production revenue	(232)	(157)
Winkler Lea Transactions
Related Party Transaction [Line Items]
Payable for net proportionate share of production revenue	(623)	(526)
Winkler Lea Transactions | Asset disposition accounted for as a financing arrangement
Related Party Transaction [Line Items]
Total	(23,768)	(23,768)
WLR
Related Party Transaction [Line Items]
Payable for net proportionate share of production revenue	(203)	(161)
WLR | Asset disposition accounted for as a financing arrangement
Related Party Transaction [Line Items]
Total	$ (13,060)	$ (13,060)