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Derivative Instruments - The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	$ 10,672	$ 16,684	$ (30,710)	$ (307)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	210,909	8,976	56,915	61,054
Gain (Loss) on Commodity Derivative Instruments:	221,581	25,660	26,205	60,747
Natural Gas | Commodity Member
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	18,567	17,058	(8,383)	16,624
Unrealized Gain (Loss) on Commodity Derivative Instruments:	226,845	46,450	176,084	49,250
Gain (Loss) on Commodity Derivative Instruments:	245,412	63,508	167,701	65,874
Natural Gas | Basis Swap
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	(7,895)	(374)	(22,327)	(16,931)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	(15,936)	(37,474)	(119,169)	11,804
Gain (Loss) on Commodity Derivative Instruments:	$ (23,831)	$ (37,848)	$ (141,496)	$ (5,127)

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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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Gain (loss) incurred in hedging activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
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The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

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-Topic 230
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-Section 45
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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