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Variable Interest Entities Statement of Operations and Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Variable Interest Entity [Line Items]    
Total Consolidated Revenue and Other Operating Income $ 495,729 $ 319,929
Loss on Asset Sales 11,342 3,996
Interest Expense 38,551 41,606
Total Expense (263,511) 458,358
Net Income 527,563 (38,966)
Net Cash Provided by Operating Activities 259,340 211,795
Net Cash Used in Investing Activities (426,344) (87,642)
Net Cash Used in Financing Activities (259,673) $ (116,686)
Variable Interest Entity, Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Gathering Revenue - Related Party 37,730  
Gathering Revenue - Third Party 26,139  
Total Consolidated Revenue and Other Operating Income 63,869  
Operating Expense - Related Party 4,435  
Operating Expense - Third Party 8,468  
General and Administrative Expense - Related Party 3,612  
General and Administrative Expense, Third Parties 2,549  
Loss on Asset Sales 2,755  
Depreciation Expense 5,856  
Interest Expense 2,489  
Total Expense 30,164  
Net Income 33,705  
Net Cash Provided by Operating Activities 41,867  
Net Cash Used in Investing Activities (10,156)  
Net Cash Used in Financing Activities $ (32,939)