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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Gain on Commodity Derivative Instruments $ 213,913 $ 18,005 $ 240,118 $ 78,752
Other Operating Income 3,316 3,903 9,436 23,146
Total Revenue 529,997 397,126 1,413,460 1,294,979
Natural Gas Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 245,815 293,864 966,574 930,505
NGLs Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 18,305 46,663 72,095 137,104
Condensate Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 839 3,426 4,846 14,925
Oil Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 92 759 347 2,317
Total Natural Gas, NGLs and Oil Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 265,051 344,712 1,043,862 1,084,851
Purchased Gas Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 29,192 10,560 64,181 38,546
Midstream Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers $ 18,525 $ 19,946 $ 55,863 $ 69,684