BUSINESS SEGMENT INFORMATION (Schedule Of Results Of Reportable Segments) (Details) - USD ($)		1 Months Ended		10 Months Ended	11 Months Ended	12 Months Ended
	Nov. 13, 2019	Nov. 30, 2019	Feb. 08, 2018	Nov. 13, 2019	Dec. 31, 2018	Dec. 31, 2019
Revenue
Operating revenue			$ 40,136,000		$ 473,473,000	$ 500,220,000
Gain on sale of assets			840,000		4,751,000	1,382,000
Gain (loss) on derivatives			6,663,000		(10,247,000)	(11,744,000)
Total revenue			47,639,000		467,977,000	489,858,000
Operating expenses
Lease operating			4,408,000		56,827,000	63,755,000
Transportation, processing and marketing			3,725,000		19,293,000	21,042,000
Midstream operating			0		15,221,000	24,719,000
Cost of sales for purchased gathered production			0		31,247,000	34,529,000
Production taxes			953,000		16,865,000	19,455,000
Workovers			423,000		5,563,000	3,189,000
Exploration			7,003,000		34,085,000	52,354,000
Depreciation, depletion and amortization			11,670,000		160,942,000	132,292,000
Impairment of assets					3,205,051,000	905,293,000
General and administrative			21,234,000		131,052,000	107,655,000
Total operating expenses			49,416,000		3,676,146,000	1,364,283,000
Operating income			(1,777,000)		(3,208,169,000)	(874,425,000)
Other income (expense)
Interest expense			(5,511,000)		(43,296,000)	(61,459,000)
Interest income and other			172,000		2,049,000	243,000
Equity in earnings of unconsolidated subsidiaries			0	$ 713,000	0	6,216,000
Reorganization items, net			0		0	(197,000)
Total other income (expense), net			(5,339,000)		(41,247,000)	(55,197,000)
Income (loss) from continuing operations before income taxes			(7,116,000)		(3,249,416,000)	(929,622,000)
Interest expense			(5,511,000)		(43,296,000)	(61,459,000)
Depreciation, depletion and amortization			11,670,000		160,942,000	132,292,000
Loss on unrealized hedges						19,386,000
Gain on unrealized hedges					(28,714,000)
Loss on sale of property and equipment					388,000	106,000
Impairment assets					3,205,051,000	905,293,000
Provision for uncollectible related party receivables					22,438,000	3,196,000
Equity-based compensation			0		22,025,000	6,412,000
Exploration			7,003,000		34,085,000	52,354,000
Severance costs						7,027,000
Strategic costs						21,620,000
Non-cash lease operating expense						3,835,000
Adjustment of investment in Cimarron to fair value based on assets received	$ 5,503,000	$ 5,500,000				(5,503,000)
Business Combination					23,717,000
Adjusted EBITDAX					233,812,000	278,052,000
Equity method investment	$ 7,316,000		0	$ 7,316,000	1,100,000	0
Capital expenditures			36,695,000		762,760,000	327,567,000
Total assets at period end					1,357,830,000	498,580,000
Oil
Revenue
Operating revenue			30,972,000		323,299,000	328,386,000
Natural gas
Revenue
Operating revenue			4,276,000		43,407,000	53,693,000
Natural gas liquids
Revenue
Operating revenue			4,000,000		43,039,000	40,026,000
Sales of gathered production
Revenue
Operating revenue			0		31,506,000	37,195,000
Gathering and processing
Revenue
Operating revenue					27,460,000	30,590,000
Segment Operating Revenue
Revenue
Operating revenue					468,711,000	489,890,000
Other
Revenue
Operating revenue			$ 888,000		4,762,000	10,330,000
Operating Segments | Upstream
Revenue
Operating revenue					414,507,000	423,576,000
Gain on sale of assets					4,751,000	1,488,000
Gain (loss) on derivatives					(10,247,000)	(11,744,000)
Total revenue					409,011,000	413,320,000
Operating expenses
Lease operating					60,547,000	79,884,000
Transportation, processing and marketing					50,038,000	70,324,000
Midstream operating					0	0
Cost of sales for purchased gathered production					0	0
Production taxes					16,865,000	19,455,000
Workovers					5,563,000	2,652,000
Exploration					34,085,000	52,354,000
Depreciation, depletion and amortization					133,554,000	120,617,000
Impairment of assets					2,033,712,000	556,427,000
General and administrative					114,735,000	59,897,000
Total operating expenses					2,449,099,000	961,610,000
Operating income					(2,040,088,000)	(548,290,000)
Other income (expense)
Interest expense					(38,265,000)	(49,823,000)
Interest income and other					1,983,000	154,000
Equity in earnings of unconsolidated subsidiaries						0
Reorganization items, net						449,000
Total other income (expense), net					(36,282,000)	(49,220,000)
Income (loss) from continuing operations before income taxes					(2,076,370,000)	(597,510,000)
Interest expense					(38,265,000)	(49,823,000)
Depreciation, depletion and amortization					133,554,000	120,617,000
Loss on unrealized hedges						19,386,000
Gain on unrealized hedges					(28,714,000)
Loss on sale of property and equipment					388,000	0
Impairment assets					2,033,712,000	556,427,000
Provision for uncollectible related party receivables					22,438,000	886,000
Equity-based compensation					20,000,000	5,718,000
Exploration					34,085,000	52,354,000
Severance costs						4,865,000
Strategic costs						8,116,000
Non-cash lease operating expense						3,835,000
Adjustment of investment in Cimarron to fair value based on assets received						0
Business Combination					23,717,000
Adjusted EBITDAX					201,075,000	224,068,000
Equity method investment					0	0
Capital expenditures					700,953,000	249,955,000
Total assets at period end					935,719,000	396,041,000
Operating Segments | Upstream | Oil
Revenue
Operating revenue					323,299,000	328,386,000
Operating Segments | Upstream | Natural gas
Revenue
Operating revenue					43,407,000	53,693,000
Operating Segments | Upstream | Natural gas liquids
Revenue
Operating revenue					43,039,000	40,026,000
Operating Segments | Upstream | Sales of gathered production
Revenue
Operating revenue					0	0
Operating Segments | Upstream | Gathering and processing
Revenue
Operating revenue					0	0
Operating Segments | Upstream | Segment Operating Revenue
Revenue
Operating revenue					409,745,000	422,105,000
Operating Segments | Upstream | Other
Revenue
Operating revenue					4,762,000	1,471,000
Operating Segments | Midstream
Revenue
Operating revenue					100,025,000	146,946,000
Gain on sale of assets					0	(106,000)
Gain (loss) on derivatives					0	0
Total revenue					100,025,000	146,840,000
Operating expenses
Lease operating					0	0
Transportation, processing and marketing					9,911,000	9,659,000
Midstream operating					15,221,000	24,719,000
Cost of sales for purchased gathered production					31,247,000	34,529,000
Production taxes					0	0
Workovers					0	537,000
Exploration					0	0
Depreciation, depletion and amortization					27,388,000	11,675,000
Impairment of assets					1,171,339,000	348,866,000
General and administrative					14,025,000	35,427,000
Total operating expenses					1,269,131,000	465,412,000
Operating income					(1,169,106,000)	(318,572,000)
Other income (expense)
Interest expense					(5,031,000)	(11,636,000)
Interest income and other					6,000	17,000
Equity in earnings of unconsolidated subsidiaries						6,216,000
Reorganization items, net						0
Total other income (expense), net					(5,025,000)	(5,403,000)
Income (loss) from continuing operations before income taxes					(1,174,131,000)	(323,975,000)
Interest expense					(5,031,000)	(11,636,000)
Depreciation, depletion and amortization					27,388,000	11,675,000
Loss on unrealized hedges						0
Gain on unrealized hedges					0
Loss on sale of property and equipment					0	106,000
Impairment assets					1,171,339,000	348,866,000
Provision for uncollectible related party receivables					0	2,310,000
Equity-based compensation					1,190,000	694,000
Exploration					0	0
Severance costs						2,162,000
Strategic costs						11,479,000
Non-cash lease operating expense						0
Adjustment of investment in Cimarron to fair value based on assets received						(5,503,000)
Business Combination					0
Adjusted EBITDAX					30,817,000	59,450,000
Equity method investment					1,100,000	0
Capital expenditures					61,807,000	77,612,000
Total assets at period end					437,721,000	112,825,000
Operating Segments | Midstream | Oil
Revenue
Operating revenue					0	0
Operating Segments | Midstream | Natural gas
Revenue
Operating revenue					0	0
Operating Segments | Midstream | Natural gas liquids
Revenue
Operating revenue					0	0
Operating Segments | Midstream | Sales of gathered production
Revenue
Operating revenue					31,506,000	37,195,000
Operating Segments | Midstream | Gathering and processing
Revenue
Operating revenue					68,519,000	84,763,000
Operating Segments | Midstream | Segment Operating Revenue
Revenue
Operating revenue					100,025,000	121,958,000
Operating Segments | Midstream | Other
Revenue
Operating revenue					0	24,988,000
Eliminations
Revenue
Operating revenue					(41,059,000)	(70,302,000)
Gain on sale of assets					0	0
Gain (loss) on derivatives					0	0
Total revenue					(41,059,000)	(70,302,000)
Operating expenses
Lease operating					(3,720,000)	(16,129,000)
Transportation, processing and marketing					(40,656,000)	(58,941,000)
Midstream operating					0	0
Cost of sales for purchased gathered production					0	0
Production taxes					0	0
Workovers					0	0
Exploration					0	0
Depreciation, depletion and amortization					0	0
Impairment of assets					0	0
General and administrative					2,292,000	12,331,000
Total operating expenses					(42,084,000)	(62,739,000)
Operating income					1,025,000	(7,563,000)
Other income (expense)
Interest expense					0	0
Interest income and other					60,000	72,000
Equity in earnings of unconsolidated subsidiaries						0
Reorganization items, net						(646,000)
Total other income (expense), net					60,000	(574,000)
Income (loss) from continuing operations before income taxes					1,085,000	(8,137,000)
Interest expense					0	0
Depreciation, depletion and amortization					0	0
Loss on unrealized hedges						0
Gain on unrealized hedges					0
Loss on sale of property and equipment					0	0
Impairment assets					0	0
Provision for uncollectible related party receivables					0	0
Equity-based compensation					835,000	0
Exploration					0	0
Severance costs						0
Strategic costs						2,025,000
Non-cash lease operating expense						0
Adjustment of investment in Cimarron to fair value based on assets received						0
Business Combination					0
Adjusted EBITDAX					1,920,000	(5,466,000)
Equity method investment					0	0
Capital expenditures					0	0
Total assets at period end					(15,610,000)	(10,286,000)
Eliminations | Oil
Revenue
Operating revenue					0	0
Eliminations | Natural gas
Revenue
Operating revenue					0	0
Eliminations | Natural gas liquids
Revenue
Operating revenue					0	0
Eliminations | Sales of gathered production
Revenue
Operating revenue					0	0
Eliminations | Gathering and processing
Revenue
Operating revenue					(41,059,000)	(54,173,000)
Eliminations | Segment Operating Revenue
Revenue
Operating revenue					(41,059,000)	(54,173,000)
Eliminations | Other
Revenue
Operating revenue					0	$ (16,129,000)
ASC 606 | Eliminations
Other income (expense)
Income (loss) from continuing operations before income taxes					$ 3,316