Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Derivatives, Fair Value [Line Items]
Commodity derivative assets - current	$ 222,036	$ 295,588	$ 769,916
Commodity derivative liabilities - current	(107,983)	(98,519)	(216,836)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	302,559	346,670	689,869
Commodity derivative liabilities	(196,740)	(213,282)	(536,015)
Cash collateral paid	9,075	64,530
Cash collateral paid			409,743
Total	114,894	197,918	563,597
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	284,879	325,762	637,947
Commodity derivative liabilities	(71,918)	(94,704)	(276,874)
Cash collateral paid	9,075	64,530
Cash collateral paid			408,843
Commodity derivative assets - current	222,036	295,588	769,916
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	4,175	1,796	15,860
Commodity derivative liabilities	(1,024)	(149)	(848)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	3,151	1,647	15,012
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	13,431	18,426	34,798
Commodity derivative liabilities	(121,414)	(116,945)	(252,534)
Cash collateral paid	0	0
Cash collateral paid			900
Commodity derivative liabilities - current	(107,983)	(98,519)	(216,836)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	74	686	1,264
Commodity derivative liabilities	(2,384)	(1,484)	(5,759)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (2,310)	$ (798)	$ (4,495)

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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