Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 20,977	$ (10,323)	$ 38,580
Commodity derivative liabilities	0	0	0
Commodity derivative assets - current	149,070	107,863	158,277
Commodity derivative liabilities - current	(90,491)	(46,942)	(66,623)
Commodity
Derivatives, Fair Value [Line Items]
Commodity derivative assets	177,730	100,931	146,801
Commodity derivative liabilities	(141,410)	(95,571)	(76,962)
Cash collateral paid	22,855	56,005
Cash collateral paid			21,751
Total	59,175	61,365	91,590
Commodity \| Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	164,700	92,429	142,262
Commodity derivative liabilities	(38,485)	(40,571)	(5,736)
Cash collateral paid	22,855	56,005
Cash collateral paid			21,751
Commodity derivative assets - current	149,070	107,863	158,277
Commodity \| Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	3,240	1,045	3,781
Commodity derivative liabilities	(119)	(96)	(24)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative assets - noncurrent	3,121	949	3,757
Commodity \| Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	9,648	7,439	665
Commodity derivative liabilities	(100,139)	(54,381)	(67,288)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - current	(90,491)	(46,942)	(66,623)
Commodity \| Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	142	18	93
Commodity derivative liabilities	(2,667)	(523)	(3,914)
Cash collateral paid	0	0
Cash collateral paid			0
Commodity derivative liabilities - noncurrent	$ (2,525)	$ (505)	$ (3,821)

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 asset or other 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 assets elected not to be offset. Excludes assets not subject to 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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