Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Derivatives, Fair Value [Line Items]
Commodity derivative assets			$ 21,363
Commodity derivative liabilities	$ (180,842)	$ (157,301)
Commodity derivative assets - current	507,148	320,706	112,089
Commodity derivative liabilities - current	(90,366)	(146,990)	(65,186)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	598,416	328,261	150,661
Commodity derivative liabilities	(388,947)	(359,464)	(105,544)
Cash collateral paid	219,469	208,670
Cash collateral paid			799
Total	428,938	177,467	45,916
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	547,186	304,533	142,110
Commodity derivative liabilities	(259,507)	(192,023)	(30,820)
Cash collateral paid	219,469	208,196
Cash collateral paid			799
Commodity derivative assets - current	507,148	320,706	112,089
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	16,480	4,328	2,916
Commodity derivative liabilities	(873)	(348)	(214)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	15,607	3,980	2,702
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	34,327	19,386	5,511
Commodity derivative liabilities	(124,693)	(166,850)	(70,697)
Cash collateral paid	0	474
Cash collateral paid			0
Commodity derivative liabilities - current	(90,366)	(146,990)	(65,186)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	423	14	124
Commodity derivative liabilities	(3,874)	(243)	(3,813)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (3,451)	$ (229)	$ (3,689)

Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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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