Capitalization of Non-cash Stock Based Compensation

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- Definition

Gain (Loss) on Expiration and Impairment of Lease

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Goodwill Impairment, Number of Days Used in Calculation

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Number of Dry Holes Drilled

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This element represents the weighted average rate at which entities gas producing properties were depleted.

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The amount of internal costs capitalized as part of oil and gas producing properties under the successful efforts method.

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A tax position is measured at the largest amount of benefit that exceeds this percentage which is likely of being realized upon ultimate settlement.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of increase (decrease) in asset retirement obligations.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of cost for defined contribution plan.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount of interest capitalized during the period.

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The fair value of liabilities assumed in noncash investing or financing activities.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / Mcfe dry_hole segment shares	Dec. 31, 2018 USD ($) $ / Mcfe dry_hole shares	Dec. 31, 2017 USD ($) $ / Mcfe dry_hole shares	Jan. 01, 2019 USD ($)	Nov. 30, 2018 USD ($)	Jan. 01, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Number of segments \| segment		1
Internal costs	$ 77,000,000	$ 77,000,000	$ 130,000,000	$ 115,000,000
Interest costs capitalized		$ 24,000,000	$ 29,000,000	$ 21,000,000
Overall average rate of depletion \| $ / Mcfe		1.01	1.04	1.04
Impairment/loss on sale/exchange of long-lived assets	1,124,400,000	$ 1,138,287,000	$ 2,709,976,000	$ 0
Impairment and expiration of leases		556,424,000	279,708,000	$ 7,552,000
Property, plant and equipment	21,655,351,000	$ 21,655,351,000	$ 22,148,012,000
Goodwill						$ 530,800,000
Number of exploratory dry holes \| dry_hole		0	0	1
Capitalized exploratory well costs	0	$ 0	$ 0	$ 0
Number of days used in calculation		30 days
Amortization expense, year 2	$ 26,000,000.0	$ 26,000,000.0
Largest amount of benefit threshold, percentage (no greater than)	50.00%	50.00%
Stock options and awards (in shares) \| shares				346,528
Anti-dilutive securities (in shares) \| shares				429,785
Expense recognized related to defined contribution plan		$ 8,900,000	17,300,000	$ 16,600,000
Asset retirement obligations, period increase		169,387,000	34,602,000	143,578,000
Measurement adjustments		0	14,377,000	(14,315,000)
Capitalization of non-cash stock based compensation		0	4,314,000	8,993,000
Liabilities assumed		$ 0	0	$ 10,004,000
Change in accounting principle							$ 4,113,000
Noncompete Agreements
Property, Plant and Equipment [Line Items]
Intangible asset useful life		3 years
Unproved Property
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,322,000,000	$ 3,322,000,000	$ 4,166,000,000
Restricted Stock
Property, Plant and Equipment [Line Items]
Anti-dilutive securities (in shares) \| shares		184,075	234,149
Share-based Payment Arrangement, Option
Property, Plant and Equipment [Line Items]
Anti-dilutive securities (in shares) \| shares		2,554,729	1,775,249
AOCI Attributable to Parent \| Accounting Standards Update 2018-02
Property, Plant and Equipment [Line Items]
Change in accounting principle					$ (500,000)
Utica Shale of Ohio
Property, Plant and Equipment [Line Items]
Impairment/loss on sale/exchange of long-lived assets	1,035,700,000
PP&E, fair value	839,400,000	$ 839,400,000
Pennsylvania and West Virgina Utica
Property, Plant and Equipment [Line Items]
Impairment/loss on sale/exchange of long-lived assets	88,700,000
PP&E, fair value	$ 26,800,000	$ 26,800,000
Huron and Permian Basin of Texas
Property, Plant and Equipment [Line Items]
Impairment/loss on sale/exchange of long-lived assets			$ 2,400,000,000