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Long-Term Debt Schedule of Long-Term Debt (Details) - USD ($) | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Less: Unamortized Debt Issuance Costs | $ 8,990,000 |  | $ 8,796,000
Long-Term Debt | 2,754,443,000 |  | 2,378,205,000
5.875% Senior Notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | 894,307,000 |  | 1,294,307,000
Debt Instrument, unamortized premium | $ 1,001,000 |  | 2,069,000
Stated rate, debt instrument | 5.875% | 5.875% |
Long-Term Debt | $ 895,308,000 |  | 1,296,376,000
Senior Notes due March 2027 at 7.25% |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 500,000,000 |  |
Stated rate, debt instrument | 7.25% |  |
Long-Term Debt | $ 500,000,000 |  | 0
Senior Notes due March 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | 400,000,000 |  |
Debt instrument, unamortized discount | $ 4,625,000 |  | 5,375,000
Stated rate, debt instrument | 6.50% |  |
Long-Term Debt | $ 395,375,000 |  | 394,625,000
CNX Revolving Credit Facility | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-Term Debt | 661,000,000 |  | 612,000,000
CNX Midstream Partners LP Revolving Credit Facility | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-Term Debt | $ 311,750,000 |  | $ 84,000,000

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