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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) | Dec. 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,000 |  |  |  |
Less: Unamortized Debt Issuance Costs | $ 26,852,000 |  |  | $ 8,990,000 |  |
Long-term Debt Including Current Maturities | 2,424,001,000 |  |  | 2,754,443,000 |  |
Less: Amounts Due in One Year | 22,574,000 |  |  | 0 |  |
Long-Term Debt | $ 2,401,427,000 |  |  | $ 2,754,443,000 |  |
Senior Notes due March 2027 at 7.25% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 0.0725% |  |  | 0.0725% |  |
Debt instrument, face amount | $ 700,000,000 |  |  | $ 500,000,000 |  |
Debt Instrument, unamortized premium | 6,686,000 |  |  |  |  |
Long-term Debt Including Current Maturities | $ 706,686,000 |  |  | 500,000,000 |  |
Senior Notes due January 2029 at 6.00% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 0.06% |  |  |  |  |
Long-term Debt Including Current Maturities | $ 500,000,000 |  |  | $ 0 |  |
Senior Notes due March 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 0.065% |  |  | 0.065% |  |
Debt instrument, face amount | $ 400,000,000 |  |  | $ 400,000,000 |  |
Debt instrument, unamortized discount | 3,875,000 |  |  | 4,625,000 |  |
Long-term Debt Including Current Maturities | $ 396,125,000 |  |  | 395,375,000 |  |
Senior Notes due May 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 0.0225% |  |  |  |  |
Debt instrument, face amount | $ 345,000,000 |  |  |  |  |
Debt instrument, unamortized discount | 107,735,000 |  |  |  |  |
Long-term Debt Including Current Maturities | $ 237,265,000 |  |  | $ 0 |  |
5.875% Senior Notes due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 5.875% |  |  | 0.00059% |  | 5.875%
Debt instrument, face amount |  |  |  | $ 894,307,000 |  |
Debt Instrument, unamortized premium |  |  |  | 1,001,000 |  |
Long-term Debt Including Current Maturities | $ 0 |  |  | 895,308,000 |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 160,000,000 |
Revolving Credit Facility | CNX Midstream Partners LP Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt Including Current Maturities | 291,000,000 |  |  | 311,750,000 |  |
Revolving Credit Facility | CNX Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt Including Current Maturities | 160,800,000 |  |  | 661,000,000 |  |
Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 175,000,000 |  |  |
Credit Facility | Cardinal States Gathering Company Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | 114,985,000 |  |  |  |  |
Debt instrument, unamortized discount | 1,126,000 |  |  |  |  |
Long-term Debt Including Current Maturities | 113,859,000 |  |  | 0 |  |
Credit Facility | CSG Holdings II LLC Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | 45,559,000 |  |  |  |  |
Debt instrument, unamortized discount | 441,000 |  |  |  |  |
Long-term Debt Including Current Maturities | $ 45,118,000 |  |  | $ 0 |  |

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