FRESH START ACCOUNTING (Schedule of Fresh Start Adjustments) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 04, 2018	Jun. 01, 2018
Fresh-Start Adjustment [Line Items]
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Successor	Successor	Predecessor	Predecessor
Current assets:
Cash and cash equivalents	$ 35,020	$ 6,313	$ 28,968	$ 6,313			$ 21,082	$ 21,082
Restricted cash			10,000					7,650
Accounts receivable:
Oil, natural gas and natural gas liquids revenues	48,986	40,176	14,075	40,176				50,247
Related party	1,503
Other	800	4,496	1,322	4,496				800
Other current assets	4,580	2,314	277	2,314				2,262
Total current assets	90,889	115,833	60,873	115,833				82,041
Oil and natural gas properties, net	1,355,504	405,688	114,031	405,688				616,018
Other assets	4,507	4,474	4,965	4,474				5,447
Total assets	1,450,900	534,494	180,185	534,494				703,506
Current liabilities:
Accounts payable and accrued liabilities	34,922	26,146	23,524	26,146				36,787
Current portion of long-term debt	297,000
Total current liabilities	331,922	27,311	24,110	27,311				36,787
Liabilities subject to compromise	356,066
Asset retirement obligations	161,661	117,529	88,668	117,529				120,020
Long-term debt, net		115,000		115,000				297,000
Other long–term liabilities	1,021	1,036	1,770	1,036			$ 121,041	1,021
Total liabilities	850,670							454,828
Commitments and contingencies (Note 14)
Stockholders’ equity:
Predecessor common unitholders	621,144
Predecessor general partner interest	(20,914)
Successor common stock		100	102	100				100
Successor additional paid-in capital		249,717	180,177	249,717				248,578
Total stockholders’ / owners’ equity	600,230							248,678
Total liabilities and equity	1,450,900	$ 534,494	$ 180,185	$ 534,494				$ 703,506
Reorganization Adjustments [Member]
Current assets:
Cash and cash equivalents	(13,938)
Restricted cash	7,650
Accounts receivable:
Oil, natural gas and natural gas liquids revenues	1,261
Related party	(1,503)
Other current assets	(527)
Total current assets	(7,057)
Other assets	1,941
Total assets	(5,116)
Current liabilities:
Accounts payable and accrued liabilities	2,177
Current portion of long-term debt	(297,000)
Total current liabilities	(294,823)
Liabilities subject to compromise	(356,066)
Long-term debt, net	297,000
Total liabilities	(353,889)
Commitments and contingencies (Note 14)
Stockholders’ equity:
Predecessor common unitholders	65,175
Predecessor general partner interest	34,920
Successor common stock	100
Successor additional paid-in capital	248,578
Total stockholders’ / owners’ equity	348,773
Total liabilities and equity	(5,116)
Fresh Start Adjustments [Member]
Accounts receivable:
Other current assets	(1,791)
Total current assets	(1,791)
Oil and natural gas properties, net	(739,486)
Other assets	(1,001)
Total assets	(742,278)
Current liabilities:
Accounts payable and accrued liabilities	(312)
Total current liabilities	(312)
Asset retirement obligations	(41,641)
Total liabilities	(41,953)
Commitments and contingencies (Note 14)
Stockholders’ equity:
Predecessor common unitholders	(686,319)
Predecessor general partner interest	(14,006)
Total stockholders’ / owners’ equity	(700,325)
Total liabilities and equity	$ (742,278)