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Long-Term Debt - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 77,000 | $ 23,413,000 | $ 7,614,000 | $ 39,048,000 |  |
Senior Notes due March 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 500,000,000 |  | $ 500,000,000 |  |  |
Stated rate, debt instrument | 7.25% |  | 7.25% |  |  |
Senior Notes due April 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 894,307,000 |  | $ 894,307,000 |  |  | $ 1,294,307,000
Stated rate, debt instrument | 5.875% | 5.875% | 5.875% | 5.875% |  |
Purchase of outstanding debt |  |  | $ 400,000,000 | $ 391,375,000 |  |
Gain (loss) on extinguishment of debt |  |  | 7,614,000 | 15,635,000 |  |
Senior Notes due March 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000 |  | $ 400,000,000 |  |  | $ 400,000,000
Stated rate, debt instrument | 6.50% |  | 6.50% |  |  |
Senior Notes due April 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate, debt instrument | 8.00% |  | 8.00% |  |  |
Purchase of outstanding debt |  | $ 300,000,000 |  | 300,000,000 |  |
Gain (loss) on extinguishment of debt |  | 23,413,000 |  | 23,413,000 |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 160,000 |  | $ 160,000 |  | $ 2,100,000,000 |
CNXM | Senior Notes due March 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | 400,000,000 |  | 400,000,000 |  |
Unamortized bond discount |  | $ 6,000,000 |  | $ 6,000,000 |  |

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