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Revenue From Contracts With Customers Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
(Loss) Gain on Commodity Derivative Instruments                 $ (30,212) $ 206,930 $ (141,021)
Other Operating Income                 26,942 69,182 64,485
Total Revenue and Other Operating Income $ 431,660 $ 393,223 $ 393,590 $ 485,019 $ 460,251 $ 267,009 $ 354,410 $ 304,279 1,730,434 1,455,131 759,968
Total Natural Gas, NGLs and Oil Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 1,577,937 1,125,224 793,248
Natural Gas                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 1,391,459 945,382 670,399
NGLs Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 165,883 156,132 97,580
Condensate Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 17,559 20,531 22,748
Oil Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 3,036 3,179 2,521
Purchased Gas Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 65,986 53,795 43,256
Midstream Revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from Contracts with Customers                 $ 89,781 $ 0 $ 0