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Fresh Start Accounting - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Nov. 19, 2020	Nov. 18, 2020	Dec. 31, 2019	Dec. 31, 2018
Fresh-Start Adjustment [Line Items]
Oil and gas properties	$ 810,328	$ 795,247	$ 9,256,532	$ 9,463,038
Less: accumulated depreciation, depletion, amortization and impairment	(17,491)	0	(8,579,696)	(3,764,915)
Other property and equipment	935,950	938,172	1,311,240	1,279,653
Less: Accumulated depreciation and impairment	5,088			163,896
Other property and equipment, net	930,862			1,115,757
Total property, plant and equipment, net	$ 1,728,787	1,733,419	$ 1,988,076	$ 6,977,776	$ 7,027,109
Fair Value
Fresh-Start Adjustment [Line Items]
Other property and equipment		938,172
Less: Accumulated depreciation and impairment		0
Other property and equipment, net		938,172
Total property, plant and equipment, net		1,733,419
Historical Book Value
Fresh-Start Adjustment [Line Items]
Oil and gas properties		9,081,974
Other property and equipment		1,311,240
Less: Accumulated depreciation and impairment		320,362
Other property and equipment, net		990,878
Total property, plant and equipment, net		1,988,076
Proved Oil and Gas Properties | Fair Value
Fresh-Start Adjustment [Line Items]
Oil and gas properties		755,247
Less: accumulated depreciation, depletion, amortization and impairment		0
Total property, plant and equipment, net		755,247
Proved Oil and Gas Properties | Historical Book Value
Fresh-Start Adjustment [Line Items]
Less: accumulated depreciation, depletion, amortization and impairment		(8,259,334)
Total property, plant and equipment, net		822,640
Unproved oil and gas properties | Fair Value
Fresh-Start Adjustment [Line Items]
Oil and gas properties		40,000
Unproved oil and gas properties | Historical Book Value
Fresh-Start Adjustment [Line Items]
Oil and gas properties		$ 174,558

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Oil and Gas properties, gross, carried under the successful effort method.

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