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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) |

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