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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Gain (Loss) on Commodity Derivative Instruments	$ 172,982	$ 376,105	$ (30,212)
Other Revenue and Operating Income	82,459	87,992	116,723
Total Revenue and Other Operating Income	1,257,978	1,922,449	1,730,434
Total Natural Gas, NGL and Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue	896,745	1,364,325	1,577,937
Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue	823,132	1,251,013	1,391,459
NGL Revenue
Disaggregation of Revenue [Line Items]
Revenue	64,138	104,139	165,883
Oil/Condensate Revenue
Disaggregation of Revenue [Line Items]
Revenue	9,475	9,173	20,595
Purchased Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 105,792	$ 94,027	$ 65,986

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Gain (loss) incurred in hedging activities.

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