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Acquisitions and Dispositions Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 02, 2018 | Mar. 30, 2018 | Jan. 03, 2018 | Dec. 14, 2017 | May 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash proceeds from Asset Exchange Agreement | $ 7,000 |  |  |  |  |  |  |  |
Net gain on sale |  |  |  |  |  | $ 3,280 | $ 134,581 | $ 14,622 | $ 138,577
Impairment of Other Intangible Assets |  |  |  |  |  | 18,650 | 0 | 18,650 | 0
Gain on remeasurement of fair value of previously held equity interest |  |  |  |  |  | $ 0 | $ 0 | $ 623,663 | $ 0
Midstream Acquisition [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration transferred |  |  | $ 305,000 | $ 305,000 |  |  |  |  |
Fair value of previously held equity interest |  |  | 799,033 |  |  |  |  |  |
Gain on remeasurement of fair value of previously held equity interest |  |  | $ 623,663 |  |  |  |  |  |
Asset Exchange Agreement with HG Energy [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net gain on sale | $ 286 |  |  |  |  |  |  |  |
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration received in sale of oil and gas assets |  | $ 89,296 |  |  |  |  |  |  |
Asset retirement obligations assumed |  | 196,514 |  |  |  |  |  |  |
Net gain on sale |  | $ 4,751 |  |  |  |  |  |  |
CNX Gathering LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  | 50.00% |  | 50.00% |  | 50.00% |
CONE Midstream GP LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  | 100.00% |  |  |  |  |
Customer Relationships [Member] | Midstream [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Impairment of Other Intangible Assets |  |  |  |  | $ 18,650 |  |  | $ 18,650 |

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