ADDITIONAL FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended		12 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Oct. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 02, 2019	Jan. 01, 2019
Accounts receivable:
Oil, natural gas and natural gas liquids revenues		$ 36,367			$ 26,432
Joint interest accounts		10,145			7,369
Other		1,992			1,917
Total	$ 37,826	48,504	$ 37,826		35,718		$ 37,826
Prepaids and other:
Prepaids		2,093			3,503
Income tax receivable		1,250			1,250
Funds in escrow		4,000
Other		36			35
Total	14,642	7,379	14,642		4,788		10,290
Funds in escrow and other:
Funds in escrow		580			570
Other		123			1,611
Total	1,138	703	1,138		2,181		1,138
Accounts payable and accrued liabilities:
Trade payables		36,038			68,959
Accrued oil and natural gas capital costs		22,781			41,461
Revenues and royalties payable		25,457			20,526
Accrued interest expense		604			16,971
Accrued employee compensation		2,947			3,421
Accrued lease operating expenses		9,230			6,292
Other		276			218
Total	$ 112,578	$ 97,333	$ 112,578		$ 157,848		$ 115,305	$ 157,763
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Predecessor	Predecessor	Predecessor	Predecessor