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Derivative Instruments Effect of Derivative Instrument on Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	$ 69,780	$ (69,720)	$ (41,174)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	306,325	39,508	248,104
Gain (Loss) on Commodity Derivative Instruments	376,105	(30,212)	206,930
Natural Gas Basis Swaps
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	(13,119)	(28,622)	(5,030)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	(100,147)	6,482	(72,648)
Gain (Loss) on Commodity Derivative Instruments	(113,266)	(22,140)	(77,678)
Natural Gas | Commodity Swaps
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	82,899	(41,098)	(34,928)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	406,472	33,026	319,605
Gain (Loss) on Commodity Derivative Instruments	489,371	(8,072)	284,677
Propane | Commodity Swaps
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	0	0	(1,216)
Unrealized Gain (Loss) on Commodity Derivative Instruments:	0	0	1,147
Gain (Loss) on Commodity Derivative Instruments	$ 0	$ 0	$ (69)

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Gain (loss) incurred in hedging activities.

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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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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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