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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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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