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Schedule of Long-Term Debt (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 2,330,780,000 | $ 2,187,289,000
Less: Unamortized Debt Issuance Costs | 11,474,000 | 17,536,000
Less: Amounts Due in One Year | 0 | 263,000
Long-Term Debt | 2,330,780,000 | 2,187,026,000
Current portion of capital lease obligation | 6,915,000 | 6,848,000
Senior Notes Due April 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 1,314,307,000 | 1,705,682,000
Debt instrument, unamortized premium | 2,416,000 | 3,544,000
Long-term debt, gross | 1,316,723,000 | 1,709,226,000
Senior Notes due April 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 200,000,000 | 500,000,000
Debt instrument, unamortized discount | 1,720,000 | 4,751,000
Long-term debt, gross | 198,281,000 | 495,249,000
Senior Notes due March 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 400,000,000 |
Debt instrument, unamortized discount | 5,750,000 |
Long-term debt, gross | 394,250,000 | 0
Other Note Maturing in 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount |  | 358,000
Debt instrument, unamortized discount |  | 8,000
Long-term debt, gross | 0 | 350,000
CNX Revolving Credit Facility [Member] | Revolving Credit Facility - CNXM [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 422,000,000 | 0
CNX Midstream Partners LP Revolving Credit Facility [Member] | Revolving Credit Facility - CNXM [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 11,000,000 | $ 0

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