Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Derivatives, Fair Value [Line Items]
Commodity derivative assets			$ 10,199
Commodity derivative liabilities	$ (58,495)	$ (10,323)
Commodity derivative assets - current	140,066	107,863	120,510
Commodity derivative liabilities - current	(79,159)	(46,942)	(67,606)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	170,483	100,931	130,195
Commodity derivative liabilities	(177,413)	(95,571)	(101,305)
Cash collateral paid	70,446	56,005
Cash collateral paid			23,997
Total	63,516	61,365	52,887
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	159,553	92,429	122,462
Commodity derivative liabilities	(89,933)	(40,571)	(29,566)
Cash collateral paid	70,446	56,005
Cash collateral paid			27,614
Commodity derivative assets - current	140,066	107,863	120,510
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	3,565	1,045	1,951
Commodity derivative liabilities	(508)	(96)	(8)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	3,057	949	1,943
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	7,323	7,439	5,715
Commodity derivative liabilities	(86,482)	(54,381)	(69,704)
Cash collateral paid	0	0
Cash collateral paid			(3,617)
Commodity derivative liabilities - current	(79,159)	(46,942)	(67,606)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	42	18	67
Commodity derivative liabilities	(490)	(523)	(2,027)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (448)	$ (505)	$ (1,960)

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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