Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Derivatives, Fair Value [Line Items]
Commodity derivative liabilities	$ (144,937)	$ (36,843)	$ (76,388)
Commodity derivative assets - current	769,916	410,813	317,939
Commodity derivative liabilities - current	(216,836)	(128,911)	(91,448)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	689,869	368,969	385,332
Commodity derivative liabilities	(536,015)	(249,114)	(249,550)
Cash collateral paid	409,743	165,250
Cash collateral paid			95,533
Total	563,597	285,105	231,315
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	637,947	339,321	357,802
Commodity derivative liabilities	(276,874)	(93,758)	(123,480)
Cash collateral paid	408,843	165,250
Cash collateral paid			83,617
Commodity derivative assets - current	769,916	410,813	317,939
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	15,860	4,677	6,762
Commodity derivative liabilities	(848)	(105)	(925)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	15,012	4,572	5,837
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	34,798	23,762	20,752
Commodity derivative liabilities	(252,534)	(152,673)	(124,116)
Cash collateral paid	900	0
Cash collateral paid			11,916
Commodity derivative liabilities - current	(216,836)	(128,911)	(91,448)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	1,264	1,209	16
Commodity derivative liabilities	(5,759)	(2,578)	(1,029)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (4,495)	$ (1,369)	$ (1,013)

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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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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