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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
(Loss) Gain on Commodity Derivative Instruments	$ (538,859)	$ (63,303)	$ (505,445)	$ 51,839
Other Revenue and Operating Income	25,494	15,944	50,445	39,308
Total Revenue and Other Operating (Loss) Income	(127,210)	148,841	345,864	565,200
Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	320,982	168,510	668,358	398,108
NGL Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	41,521	6,226	73,384	25,638
Oil/Condensate Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	6,946	1,040	8,932	3,524
Total Natural Gas, NGL and Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	369,449	175,776	750,674	427,270
Purchased Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	$ 16,706	$ 20,424	$ 50,190	$ 46,783

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