Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
(Loss) Gain on Commodity Derivative Instruments	$ (63,303)	$ 221,581	$ 51,839	$ 26,205
Other Operating Income	3,753	2,923	8,711	6,120
Total Revenue	148,841	605,032	565,200	883,463
Natural Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	168,510	317,071	398,108	720,758
NGL Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	6,226	24,025	25,638	53,790
Condensate Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	781	1,680	2,682	4,007
Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	259	89	842	256
Total Natural Gas, NGL and Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	175,776	342,865	427,270	778,811
Purchased Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	20,424	18,768	46,783	34,989
Midstream Revenue
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	$ 12,191	$ 18,895	$ 30,597	$ 37,338