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Variable Interest Entities Statement of Operations and Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Variable Interest Entity [Line Items]        
Total Revenue $ 402,124 $ 371,068 $ 897,853 $ 690,996
(Gain) Loss on Asset Sales (3,280) (134,581) (14,622) (138,577)
Interest Expense 38,438 40,683 76,989 82,289
Total Expense 371,832 191,303 108,321 649,659
Net Income 42,014 $ 169,510 569,577 130,544
Net Cash Provided by Operating Activities     450,930 300,472
Net Cash Used in Investing Activities     (638,861) 96,525
Net Cash Used in Financing Activities     (266,390) $ (151,761)
Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Gathering Revenue - Related Party 37,576   75,306  
Gathering Revenue - Third Party 23,438   49,577  
Total Revenue 61,014   124,883  
Operating Expense - Related Party 5,079   9,514  
Operating Expense - Third Party 7,406   15,874  
General and Administrative Expense - Related Party 3,619   7,232  
General and Administrative Expense - Third Party 2,320   4,868  
(Gain) Loss on Asset Sales (254)   2,501  
Depreciation Expense 5,443   11,299  
Interest Expense 7,119   9,608  
Total Expense 30,732   60,896  
Net Income 30,282   63,987  
Net Cash Provided by Operating Activities 53,674   95,541  
Net Cash Used in Investing Activities (24,969)   (35,125)  
Net Cash Used in Financing Activities $ (29,964)   $ (62,903)