Derivatives (Current and Noncurrent Derivative Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Commodity derivative assets - current	$ 410,813	$ 320,706
Commodity derivative liabilities - current	(128,911)	(146,990)
Commodity Contract
Derivatives, Fair Value [Line Items]
Commodity derivative assets	368,969	328,261
Commodity derivative liabilities	(249,114)	(359,464)
Cash collateral paid	165,250	208,670
Total	285,105	177,467
Commodity Contract \| Commodity derivative assets - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	339,321	304,533
Commodity derivative liabilities	(93,758)	(192,023)
Cash collateral paid	165,250	208,196
Commodity derivative assets - current	410,813	320,706
Commodity Contract \| Commodity derivative assets - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	4,677	4,328
Commodity derivative liabilities	(105)	(348)
Cash collateral paid	0	0
Commodity derivative assets - noncurrent	4,572	3,980
Commodity Contract \| Commodity derivative liabilities - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	23,762	19,386
Commodity derivative liabilities	(152,673)	(166,850)
Cash collateral paid	0	474
Commodity derivative liabilities - current	(128,911)	(146,990)
Commodity Contract \| Commodity derivative liabilities - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	1,209	14
Commodity derivative liabilities	(2,578)	(243)
Cash collateral paid	0	0
Commodity derivative liabilities - noncurrent	$ (1,369)	$ (229)

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 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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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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