Disclosures about Fair Value - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($) $ / bbl	Mar. 31, 2019 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Leasehold abandonments and impairments	$ 556,512	$ 22,189
Inflation factor	2.00%
Expected future cash flow discount rate	11.00%
Impairment of oil and gas properties	$ 4,374,253	$ 0
Impairment of leasehold, probable losses on acreage	531,100
Impairment of leasehold, lease expiring	12,400
Impairment of leasehold acreage expiring	13,000
Property, Plant and Equipment, Other Types
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Leasehold abandonments and impairments	100
Materials and Supplies [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value adjustment	3,400
Midland Area
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of oil and gas properties	3,100,000
Delaware Basin Area
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of oil and gas properties	$ 1,300,000
Minimum \| Oil
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Oil and gas, average sale price \| $ / bbl	29.02
Minimum \| Natural Gas
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Oil and gas, average sale price \| $ / bbl	2.03
Maximum \| Oil
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Oil and gas, average sale price \| $ / bbl	57.22
Maximum \| Natural Gas
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Oil and gas, average sale price \| $ / bbl	3.04

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Sales price per unit of oil and gas produced.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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