Derivatives (Current and Noncurrent Derivative Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Commodity derivative assets - current	$ 320,706	$ 107,863
Commodity derivative liabilities - current	(146,990)	(46,942)
Commodity Contract
Derivatives, Fair Value [Line Items]
Commodity derivative assets	328,261	100,931
Commodity derivative liabilities	(359,464)	(95,571)
Cash collateral paid	208,670	56,005
Total	177,467	61,365
Commodity Contract \| Commodity derivative assets - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	304,533	92,429
Commodity derivative liabilities	(192,023)	(40,571)
Cash collateral paid	208,196	56,005
Commodity derivative assets - current	320,706	107,863
Commodity Contract \| Commodity derivative assets - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	4,328	1,045
Commodity derivative liabilities	(348)	(96)
Cash collateral paid	0	0
Commodity derivative assets - noncurrent	3,980	949
Commodity Contract \| Commodity derivative liabilities - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	19,386	7,439
Commodity derivative liabilities	(166,850)	(54,381)
Cash collateral paid	474	0
Commodity derivative liabilities - current	(146,990)	(46,942)
Commodity Contract \| Commodity derivative liabilities - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	14	18
Commodity derivative liabilities	(243)	(523)
Cash collateral paid	0	0
Commodity derivative liabilities - noncurrent	$ (229)	$ (505)

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 right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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