REVENUE (Schedule of Topic 606 Impact) (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2018	May 31, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Total revenues	$ 21,720	$ 43,089	$ 16,138	$ 23,249	$ 30,587	$ 43,846	$ 47,914	$ 68,966	$ 67,942	$ 111,031	$ 138,600	$ 113,820	$ 225,693
Lease operating expense										45,372	64,100	77,798
Oil, natural gas and natural gas liquids revenues
Total revenues										110,307	137,169	112,419	$ 223,297
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Lease operating expense										2,054	2,937	(449)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Oil, natural gas and natural gas liquids revenues
Total revenues										2,054	2,937	(449)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Lease operating expense										43,318	61,163	78,247
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Oil, natural gas and natural gas liquids revenues
Total revenues										$ 108,253	$ 134,232	$ 112,868