FRESH START ACCOUNTING (Reorganization Adjustments and Fresh Start Adjustments) (Details) - USD ($) $ / shares in Units, $ in Thousands		5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 01, 2018	May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 04, 2018	Jun. 02, 2018
Financial Designation, Predecessor and Successor [Fixed List]		Predecessor	Successor	Successor	Successor	Predecessor	Predecessor
Cash and Cash Equivalents [Abstract]
Payment of professional fees		$ (13,345)	$ (2,323)
Transfer of funds from Predecessor's general partner		40
Cancellation of Related party claims		200
Deferred financing cost related to credit facility		2,800
Deferred financing cost related to credit facility		800
Accounts Payable and Accrued Liabilities [Abstract]
Net increase in accounts payable and accrued liabilities		(4,405)	$ 513	$ (1,377)		$ 6,783
Borrowings under credit facility reclassified to long-term debt		297,000
Disallowed interest payable not included in accrued interest payable		4,700
Liabilities Subject to Compromise [Abstract]
Senior Notes		343,348
Accrued interest payable		12,718
Total liabilities subject to compromise of Predecessor		356,066
Issuance of common stock to holders of the Senior Notes		(227,366)
Gain on settlement of liabilities subject to compromise		128,700
Contributions from general partner		40
Issuance of common stock to Predecessor common unitholders		(11,967)
Issuance of warrants to Predecessor common unitholders		$ (9,345)
Common stock, shares issued		10,000,016	10,054,816	10,221,008	10,054,816
Common stock, par or stated value per share		$ 0.01	$ 0.01	$ 0.01	$ 0.01			$ 0.01
Number of warrants issued		800,000
Fair value of warrants per share		$ 11.68
Stockholders’ equity:
Issuance of share of Successor common stock at par value of $0.01 per share	$ 100
Additional paid-in capital from issuance of Successor common stock	239,233
Additional paid-in capital from issuance of Successor warrants	9,345
Fair value of successor equity	248,678		$ 273,539	$ 65,371	$ 273,539			$ 248,678	$ 248,678
Proved oil and natural gas properties	547,136	$ 2,593,249	410,184	128,578	410,184
Unproved oil and natural gas properties	68,882		8,454	519	8,454
Oil and natural gas properties, gross	616,018	2,593,249	418,638	129,097	418,638
Accumulated depreciation, depletion and amortization		(1,237,745)	(12,950)	(15,066)	(12,950)
Net capitalized costs	$ 616,018	1,355,504	$ 405,688	$ 114,031	$ 405,688
Decrease in asset retirement obligations		(42,000)
General Partner Interest
Cash and Cash Equivalents [Abstract]
Transfer of funds from Predecessor's general partner		40
Liabilities Subject to Compromise [Abstract]
Gain on settlement of liabilities subject to compromise		2,426
Contributions from general partner		40
Cancellation of Predecessor common unitholders / general partner interest		32,454
Predecessor equity reorganization adjustments		34,920
Common Unitholders
Liabilities Subject to Compromise [Abstract]
Gain on settlement of liabilities subject to compromise		118,940
Issuance of common stock to Predecessor common unitholders		(11,967)
Issuance of warrants to Predecessor common unitholders		(9,345)
Cancellation of Predecessor common unitholders / general partner interest		(32,453)
Predecessor equity reorganization adjustments		65,175
Reorganization Adjustments [Member]
Cash and Cash Equivalents [Abstract]
Funding of the professional fees escrow account		(7,650)
Payment of debt issuance costs on the Successor Exit Credit Facility		(2,813)
Payment of professional fees		(1,591)
Payment of success fees		(1,573)
Payment of derivative settlement		(216)
Payment of accrued interest payable under the Predecessor credit facility		(135)
Transfer of funds from Predecessor's general partner		40
Changes in cash and cash equivalents		(13,938)
Accounts Payable and Accrued Liabilities [Abstract]
Recognition of payables for success fees		4,086
Recognition of payables for professional fees		32
Payment of professional fees		(1,590)
Payment of derivative settlement		(216)
Payment of accrued interest payable under the Predecessor credit facility		(135)
Net increase in accounts payable and accrued liabilities		2,177
Liabilities Subject to Compromise [Abstract]
Contributions from general partner		$ 40