RELATED PARTY TRANSACTIONS - Summary of related party transactions (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) well	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Total	$ (38,177)	$ (37,672)
Varde Partners, Inc.
Related Party Transaction [Line Items]
Number of wells operated (in wells) | well	2
Payable for net proportionate share of production revenue	$ 0	(157)
Receivable balance outstanding for operating costs in excess of production revenue associated with VPD's proportionate share of producing wells	73	0
WLWI
Related Party Transaction [Line Items]
Payable for net proportionate share of production revenue	(1,235)	(526)
WLR
Related Party Transaction [Line Items]
Payable for net proportionate share of production revenue	(187)	(161)
Asset disposition accounted for as a financing arrangement | WLWI
Related Party Transaction [Line Items]
Total	(23,768)	(23,768)
Asset disposition accounted for as a financing arrangement | WLR
Related Party Transaction [Line Items]
Total	$ (13,060)	$ (13,060)