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Revenue from Contract with Cusomter Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers $ 405,623 $ 317,763
Gain (Loss) on Commodity Derivative Instruments 35,087 (22,463)
Other Operating Income 10,710 15,650
Total Revenue and Other Operating Income 495,729 319,929
Natural Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers 347,348 273,546
NGLs [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers 50,884 39,283
Condensate [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers 6,503 4,305
Oil [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers 888 629
Purchased Gas [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers 18,055 8,979
Midstream [Member]    
Disaggregation of Revenue [Line Items]    
Total Segment Revenue from Contracts with External Customers $ 26,254 $ 0