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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Gain on Commodity Derivative Instruments	$ 33,414	$ 115,142
Other Revenue and Operating Income	24,950	23,364
Total Revenue and Other Operating Income	473,073	416,359
Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	347,376	229,599
NGL Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	31,863	19,412
Oil/Condensate Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	1,986	2,483
Total Natural Gas, NGL and Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	381,225	251,494
Purchased Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers:	$ 33,484	$ 26,359

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Gain (loss) incurred in hedging activities.

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