LONG TERM DEBT - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 21, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Principal Balance	$ 1,127,733		$ 835,140
Unamortized Net Discount (Premium)	4,860		13,237
Debt Issuance Costs, Net	(14,432)		(18,174)
Long-term Debt, Net	1,118,161		830,203
Revolving Credit Facility | Other Noncurrent Assets
Line of Credit Facility [Line Items]
Debt Issuance Costs, Net	(9,800)		(5,100)
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Principal Balance	580,000		140,000
Unamortized Net Discount (Premium)	0		0
Debt Issuance Costs, Net	0		0
Long-term Debt, Net	580,000		140,000
Second Lien Notes due 2023
Line of Credit Facility [Line Items]
Principal Balance	417,733		695,140
Unamortized Net Discount (Premium)	6,031		13,237
Debt Issuance Costs, Net	(14,283)		(18,174)
Long-term Debt, Net	409,482		$ 690,203
Second Lien Notes due 2023 | Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt, Net		$ 200,000
Unsecured VEN Bakken Note
Line of Credit Facility [Line Items]
Principal Balance	130,000
Unamortized Net Discount (Premium)	(1,172)
Debt Issuance Costs, Net	(149)
Long-term Debt, Net	$ 128,679