Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]
Proved Oil and Gas Properties and Other Assets Carrying Amount	$ 1,424,000
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period	264,000
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Property, Plant and Equipment	1,160,000
Pretax Impairment Changes For Other Assets	72,000
Debt Disclosure [Abstract]
Aggregate Principal Amount of Current and Long-Term Debt	5,640,000	$ 5,140,000
Estimated Fair Value of Debt	6,416,000	5,452,000
Commodity Contract [Member] \| Crude Oil \| Price Swaps
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	224,256
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		23,266
Commodity Contract [Member] \| Crude Oil \| Price Swaps \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0
Commodity Contract [Member] \| Crude Oil \| Price Swaps \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	224,256
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		23,266
Commodity Contract [Member] \| Crude Oil \| Price Swaps \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0
Commodity Contract [Member] \| Crude Oil \| Roll Differential Swap
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2,396
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	16,855
Commodity Contract [Member] \| Crude Oil \| Roll Differential Swap \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Crude Oil \| Roll Differential Swap \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2,396
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	16,855
Commodity Contract [Member] \| Crude Oil \| Roll Differential Swap \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Price Swaps
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2,533
Commodity Contract [Member] \| Natural Gas \| Price Swaps \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Price Swaps \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2,533
Commodity Contract [Member] \| Natural Gas \| Price Swaps \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Collars
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	4,338
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	4,313
Commodity Contract [Member] \| Natural Gas \| Collars \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Collars \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	4,338
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	4,313
Commodity Contract [Member] \| Natural Gas \| Collars \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Basis Swaps
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	6	970
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	10,671
Commodity Contract [Member] \| Natural Gas \| Basis Swaps \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas \| Basis Swaps \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	6	970
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	10,671
Commodity Contract [Member] \| Natural Gas \| Basis Swaps \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas Liquids \| Price Swaps
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	7,064	3,401
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	166
Commodity Contract [Member] \| Natural Gas Liquids \| Price Swaps \| Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Commodity Contract [Member] \| Natural Gas Liquids \| Price Swaps \| Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	7,064	3,401
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	166
Commodity Contract [Member] \| Natural Gas Liquids \| Price Swaps \| Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0
Assets From Price Risk Management Activities
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	$ 207,000	1,000
Liabilities From Price Risk Management Activities
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		$ 20,000

Pretax impairment charges for other assets

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- Definition

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

+ References

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- Definition

Fair value of proved oil and gas property and other property, plant and equipment and other assets as of the balance sheet date.

+ References

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Net dollar amount capitalized on balance sheet representing an enterprise's interests in proved crude oil (including condensate and natural gas liquids) and/or natural gas properties.

+ References

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Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
-SubTopic 20
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Fair value of financial and nonfinancial obligations.

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