Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Commodity derivative assets			$ 20,977
Commodity derivative liabilities	$ (76,388)	$ (157,301)
Commodity derivative assets - current	317,939	320,706	149,070
Commodity derivative liabilities - current	(91,448)	(146,990)	(90,491)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	385,332	328,261	177,730
Commodity derivative liabilities	(249,550)	(359,464)	(141,410)
Cash collateral paid	95,533	208,670
Cash collateral paid			22,855
Total	231,315	177,467	59,175
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	357,802	304,533	164,700
Commodity derivative liabilities	(123,480)	(192,023)	(38,485)
Cash collateral paid	83,617	208,196
Cash collateral paid			22,855
Commodity derivative assets - current	317,939	320,706	149,070
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	6,762	4,328	3,240
Commodity derivative liabilities	(925)	(348)	(119)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	5,837	3,980	3,121
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	20,752	19,386	9,648
Commodity derivative liabilities	(124,116)	(166,850)	(100,139)
Cash collateral paid	11,916	474
Cash collateral paid			0
Commodity derivative liabilities - current	(91,448)	(146,990)	(90,491)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	16	14	142
Commodity derivative liabilities	(1,029)	(243)	(2,667)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (1,013)	$ (229)	$ (2,525)

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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