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Revenue From Contracts With Customers Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Gain on Commodity Derivative Instruments $ 18,005 $ 19,183 $ 78,752 $ 80,508
Other Operating Income 3,903 20,176 23,146 52,483
Total Revenue 397,126 287,185 1,294,979 978,180
Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 293,864 196,285 930,505 703,556
NGLs [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 46,663 33,220 137,104 94,139
Condensate [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 3,426 4,306 14,925 12,495
Oil [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 759 631 2,317 2,321
Oil and Gas Service [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 344,712 234,442 1,084,851 812,511
Purchased Gas Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers 10,560 13,384 38,546 32,678
Midstream Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customers $ 19,946 $ 0 $ 69,684 $ 0