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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	Dec. 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000
Less: Unamortized Debt Issuance Costs	$ 26,852,000			$ 8,990,000
Long-term Debt Including Current Maturities	2,424,001,000			2,754,443,000
Less: Amounts Due in One Year	22,574,000			0
Long-Term Debt	$ 2,401,427,000			$ 2,754,443,000
Senior Notes due March 2027 at 7.25%
Debt Instrument [Line Items]
Stated rate, debt instrument	0.0725%			0.0725%
Debt instrument, face amount	$ 700,000,000			$ 500,000,000
Debt Instrument, unamortized premium	6,686,000
Long-term Debt Including Current Maturities	$ 706,686,000			500,000,000
Senior Notes due January 2029 at 6.00%
Debt Instrument [Line Items]
Stated rate, debt instrument	0.06%
Long-term Debt Including Current Maturities	$ 500,000,000			$ 0
Senior Notes due March 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	0.065%			0.065%
Debt instrument, face amount	$ 400,000,000			$ 400,000,000
Debt instrument, unamortized discount	3,875,000			4,625,000
Long-term Debt Including Current Maturities	$ 396,125,000			395,375,000
Senior Notes due May 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	0.0225%
Debt instrument, face amount	$ 345,000,000
Debt instrument, unamortized discount	107,735,000
Long-term Debt Including Current Maturities	$ 237,265,000			$ 0
5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Stated rate, debt instrument	5.875%			0.00059%		5.875%
Debt instrument, face amount				$ 894,307,000
Debt Instrument, unamortized premium				1,001,000
Long-term Debt Including Current Maturities	$ 0			895,308,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount					$ 160,000,000
Revolving Credit Facility | CNX Midstream Partners LP Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt Including Current Maturities	291,000,000			311,750,000
Revolving Credit Facility | CNX Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt Including Current Maturities	160,800,000			661,000,000
Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount			$ 175,000,000
Credit Facility | Cardinal States Gathering Company Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount	114,985,000
Debt instrument, unamortized discount	1,126,000
Long-term Debt Including Current Maturities	113,859,000			0
Credit Facility | CSG Holdings II LLC Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount	45,559,000
Debt instrument, unamortized discount	441,000
Long-term Debt Including Current Maturities	$ 45,118,000			$ 0

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

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