Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Derivatives, Fair Value [Line Items]
Commodity derivative liabilities	$ (14,100)	$ (157,301)	$ (58,495)
Commodity derivative assets - current	409,647	320,706	140,065
Commodity derivative liabilities - current	(78,702)	(146,990)	(79,159)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	419,591	328,261	170,483
Commodity derivative liabilities	(221,473)	(359,464)	(177,413)
Cash collateral paid	136,977	208,670
Cash collateral paid			70,446
Total	335,095	177,467	63,516
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	380,391	304,533	159,553
Commodity derivative liabilities	(107,721)	(192,023)	(89,933)
Cash collateral paid	136,977	208,196
Cash collateral paid			70,446
Commodity derivative assets - current	409,647	320,706	140,066
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	11,704	4,328	3,565
Commodity derivative liabilities	(370)	(348)	(508)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	11,334	3,980	3,057
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	27,035	19,386	7,323
Commodity derivative liabilities	(105,737)	(166,850)	(86,482)
Cash collateral paid	0	474
Cash collateral paid			0
Commodity derivative liabilities - current	(78,702)	(146,990)	(79,159)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	461	14	42
Commodity derivative liabilities	(7,645)	(243)	(490)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (7,184)	$ (229)	$ (448)

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 asset or other 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 assets elected not to be offset. Excludes assets not subject to 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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Fair value, after the 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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