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Acquisitions and Dispositions Narrative (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) a | May 02, 2018 USD ($) well | Mar. 30, 2018 USD ($) | Jan. 03, 2018 USD ($) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($) a | Jun. 30, 2017 USD ($) a well | May 31, 2017 USD ($) a | Apr. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) a well | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 14, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proved Undeveloped Acreage | a |  |  |  |  |  |  |  |  |  |  | 28,916,000 |  |  |
Proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  | $ 45,160 | $ 511,767 | $ 414,185 |
Net gain (loss) on sale |  |  |  |  |  |  |  |  |  |  | 35,563 | 157,015 | 188,063 |
Impairment of other intangibles |  |  |  |  |  |  |  |  |  |  | 0 | 18,650 | 0 |
Gain on remeasurement of fair value of previously held equity interest |  |  |  |  |  |  |  |  |  |  | $ 0 | 623,663 | 0 |
Producing Gas Wells (including Gob Wells) | well |  |  |  |  |  |  | 12 |  |  |  | 6,512,000 |  |  |
Drilled but uncompleted wells | well |  |  |  |  |  |  | 15 |  |  |  |  |  |  |
Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  | $ 305,000 |  |  |  |  |  |  |  |  |  |
Fair value of previously held equity interest |  |  |  | 799,033 |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of fair value of previously held equity interest |  |  |  | $ 623,663 |  |  |  |  |  |  |  |  |  |
Ohio Utica Joint Venture Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proved Undeveloped Acreage | a | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets | $ 381,124 |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale | $ 130,710 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Exchange Agreement with HG Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  | $ 286 |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from Asset Exchange Agreement |  | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of wells added to existing commitment | well |  | 40 |  |  |  |  |  |  |  |  |  |  |  |
Shallow Oil, Gas, and CBM Assets in Pennsylvania and West Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  | $ 4,227 |  |  |  |  |  |  |  |  |  |  |
Cash consideration received in sale of oil and gas assets |  |  | 89,921 |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligations assumed |  |  | $ 196,514 |  |  |  |  |  |  |  |  |  |  |
Surface Land, Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  | $ 18,758 |  |  |  |  |  |  |  |
Net acres of land | a |  |  |  |  |  | 22,000 |  |  |  |  |  |  |  |
Proceeds sale of land |  |  |  |  |  | $ 23,703 |  |  |  |  |  |  |  |
Marcellus Shale Acres, Allegheny and Westmoreland County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  |  |  |  | $ 15,251 |  |  |  |
Net acres of land | a |  |  |  |  |  | 7,500 |  |  |  |  |  |  |  |
Proceeds sale of land |  |  |  |  |  |  |  |  |  | $ 36,649 |  |  |  |
Marcellus And Utica Shale, Allegheny, Washington And Westmoreland Counties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  | $ 58,541 |  |  |  |  |  |  |
Net acres of land | a |  |  |  |  |  |  | 11,100 |  |  |  |  |  |  |
Proceeds sale of land |  |  |  |  |  |  | $ 83,500 |  |  |  |  |  |  |
Marcellus And Utica Acres, Doddridge And Wetzel Counties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  | $ 9,430 |  |  |  |  |  |  |
Net acres of land | a |  |  |  |  |  |  | 11,000 |  |  |  |  |  |  |
Proceeds sale of land |  |  |  |  |  |  | $ 125,507 |  |  |  |  |  |  |
Utica Point Pleasant Shale Acres, Jefferson, Belmont And Guernsey Counties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  |  | $ 72,346 |  |  |  |  |  |
Net acres of land | a |  |  |  |  |  |  |  | 6,300 |  |  |  |  |  |
Proceeds sale of land |  |  |  |  |  |  |  | $ 76,585 |  |  |  |  |  |
Knox and Coalfield |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale |  |  |  |  |  |  |  |  |  |  |  | 606 |  |
Impairment on Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 137,865 |
CNX Gathering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 50.00%
Customer Relationships | Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of other intangibles |  |  |  |  | $ 18,650 |  |  |  |  |  |  | $ 18,650 |  |
CONE Midstream GP LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Discontinued Operations, Disposed of by Sale | Knox and Coalfield |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary, previously classified as held for sale |  |  |  |  |  |  |  |  | $ 19,055 |  |  |  |  |

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