ACQUISITIONS AND DIVESTITURES - Narrative (Details)				12 Months Ended
	Feb. 28, 2020 USD ($) a	Aug. 16, 2019 USD ($) a	Jul. 31, 2019 USD ($) a well agreement	Dec. 31, 2019 USD ($) well property	Dec. 31, 2018 USD ($) shares
Business Acquisition [Line Items]
Number of noncontiguous net acres sold (in acres) | a		513
Proceeds from sale of land held-for-investment		$ 16,700,000
Loss on early extinguishment of debt				$ 1,299,000	$ 20,370,000
OneEnergy Partners Operating, LLC
Business Acquisition [Line Items]
Payments for asset acquisition					$ 40,000,000
Equity interest issued or issuable (in shares) | shares					6,940,722
Consideration transferred, equity interests issued and issuable					$ 24,900,000
Purchase price before acquisition costs					64,900,000
Transaction costs and purchase price adjustments					1,100,000
VPD Texas, L.P.
Business Acquisition [Line Items]
Payments for asset acquisition					11,100,000
Transaction costs and purchase price adjustments					500,000
Anadarko
Business Acquisition [Line Items]
Payments for asset acquisition					7,100,000
Ameradev II, LLC
Business Acquisition [Line Items]
Payments for asset acquisition					7,200,000
Felix Energy Holdings II, LLC
Business Acquisition [Line Items]
Payments for asset acquisition					400,000
Southwest Royalties, LLC
Business Acquisition [Line Items]
Payments for asset acquisition					$ 17,000,000
Winkler Lea Transactions
Business Acquisition [Line Items]
Number of agreements | agreement			2
Proceeds from sale of overriding royalty interests and non-operated working interests			$ 39,000,000
WLR
Business Acquisition [Line Items]
Area of land (in acres) | a			1,446
Percentage of net revenue interests			25.00%
Period of option to repurchase overriding royalty interests			3 years
Period of limitations on ability to transfer overriding royalty interests			3 years
Purchase and sale agreement, proportionate share of production included in interest expense				$ 400,000
Purchase and sale agreement, payments for repurchase of overriding revenue interest		2,600,000
Loss on early extinguishment of debt		$ 1,300,000
WLWI
Business Acquisition [Line Items]
Area of land (in acres) | a			749
Purchase and sale agreement, repurchase price multiple			1.5
Percent of non-operating working interests			49.00%
Number of wells (in wells) | well			5	5
Purchase and sale agreement, covenant, liquidated damages			$ 150,000
Purchase and sale agreement, covenant, additional daily liquidated damages			$ 1,500
Purchase and sale agreement, covenant, additional daily liquidated damages, period after commitment date			60 days
Number of producing commitment wells (in wells) | well				3
Period of option to repurchase non-operating working interests			3 years
Period of limitations on ability to transfer non-operating working interests			3 years
Purchase and sale agreement, proportionate share of production included in interest expense				$ 500,000
Purchase and sale agreement, number of producing properties (in properties) | property				0
Purchase and Sale Agreement, Repurchase Period One | Winkler Lea Transactions
Business Acquisition [Line Items]
Period of option to repurchase overriding royalty interests			2 years
Purchase and sale agreement, repurchase price multiple			1.5
Purchase and Sale Agreement, Repurchase Period Two | Winkler Lea Transactions
Business Acquisition [Line Items]
Purchase and sale agreement, repurchase price multiple			1.75
Subsequent Event
Business Acquisition [Line Items]
Proceeds from sale of land held-for-investment	$ 24,100,000
Purchase and sale agreement, number of undeveloped net acres sold (in acres) | a	1,185