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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jun. 30, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Less: Unamortized Debt Issuance Costs | $ 24,859,000 | $ 26,852,000 |  |
Total Debt | 2,289,068,000 | 2,424,001,000 |  |
Less: Amounts Due in One Year | 23,098,000 | 22,574,000 |  |
Long-Term Debt | $ 2,265,970,000 | $ 2,401,427,000 |  |
Senior Notes Due March 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate, debt instrument | 7.25% | 7.25% |  |
Debt instrument, face amount | $ 700,000,000 | $ 700,000,000 |  |
Debt instrument, unamortized premium | 6,147,000 | 6,686,000 |  |
Total Debt | $ 706,147,000 | $ 706,686,000 |  |
Senior Notes due January 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate, debt instrument | 6.00% | 6.00% |  |
Total Debt | $ 500,000,000 | $ 500,000,000 |  |
Senior Notes Due March 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate, debt instrument | 6.50% | 6.50% |  |
Debt instrument, face amount | $ 400,000,000 | $ 400,000,000 |  |
Debt instrument, unamortized discount | 3,500,000 | 3,875,000 |  |
Total Debt | $ 396,500,000 | $ 396,125,000 |  |
Convertible Senior Notes Due May 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated rate, debt instrument | 2.25% | 2.25% |  |
Debt instrument, face amount | $ 345,000,000 | $ 345,000,000 |  |
Debt instrument, unamortized discount | 99,695,000 | 107,735,000 |  |
Total Debt | 245,305,000 | 237,265,000 |  |
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] |  |  |  |
Total Debt | 160,000,000 | 291,000,000 |  |
Revolving Credit Facility | CNX Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Debt | 160,000,000 | 160,800,000 |  |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 175,000,000 |
Line of Credit | Cardinal States Gathering Company Credit Facility maturing in March 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 107,705,000 | 114,985,000 |  |
Debt instrument, unamortized discount | 1,048,000 | 1,126,000 |  |
Total Debt | 106,657,000 | 113,859,000 |  |
Line of Credit | CSG Holdings II LLC Credit Facility maturing in March 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount | 39,726,000 | 45,559,000 |  |
Debt instrument, unamortized discount | 408,000 | 441,000 |  |
Total Debt | $ 39,318,000 | $ 45,118,000 |  |

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