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Revenue From Contracts With Customers Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Gain (Loss) on Commodity Derivative Instruments									$ 376,105	$ (30,212)	$ 206,930
Other Operating Income									13,678	26,942	69,182
Total Revenue and Other Operating Income	$ 504,747	$ 526,681	$ 602,109	$ 275,234	$ 431,660	$ 393,223	$ 393,590	$ 485,019	1,922,449	1,730,434	1,455,131
Total Natural Gas, NGLs and Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									1,364,325	1,577,937	1,125,224
Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									1,251,013	1,391,459	945,382
NGLs Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									104,139	165,883	156,132
Condensate Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									8,751	17,559	20,531
Oil Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									422	3,036	3,179
Purchased Gas Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									94,027	65,986	53,795
Midstream Revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									$ 74,314	$ 89,781	$ 0

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Gain (loss) incurred in hedging activities.

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