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Long-Term Debt (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 08, 2018 | Mar. 07, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 23,413,000 | $ 36,000 | $ 39,048,000 | $ (786,000) |  |  |
Senior Notes due March 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | 400,000,000 |  | 400,000,000 |  |  |  |
Senior Notes Due April 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | 1,314,307,000 |  | 1,314,307,000 |  |  |  | $ 1,705,682,000
Repurchase amount on debt instrument | 391,375,000 |  | 391,375,000 |  |  |  |
Gain (loss) on extinguishment of debt |  | 36,000 | 15,635,000 | (786,000) |  |  |
Debt Instrument, Purchase of Outstanding Debt |  | $ 19,069,000 |  | $ 119,025,000 |  |  |
Senior Notes due April 2023 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | 200,000,000 |  | 200,000,000 |  |  |  | $ 500,000,000
Repurchase amount on debt instrument | 300,000,000 |  | 300,000,000 |  |  |  |
Gain (loss) on extinguishment of debt |  |  | 23,413,000 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 2,100,000,000 | $ 1,500,000,000 |
CNXM [Member] | Senior Notes due March 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000 |  | $ 400,000,000 |  |  |  |
Stated rate, debt instrument | 6.50% |  | 6.50% |  |  |  |
Unamortized bond discount | $ 6,000,000 |  | $ 6,000,000 |  |  |  |

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