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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Less: Unamortized Debt Issuance Costs	$ 24,859,000	$ 26,852,000
Total Debt	2,289,068,000	2,424,001,000
Less: Amounts Due in One Year	23,098,000	22,574,000
Long-Term Debt	$ 2,265,970,000	$ 2,401,427,000
Senior Notes Due March 2027
Debt Instrument [Line Items]
Stated rate, debt instrument	7.25%	7.25%
Debt instrument, face amount	$ 700,000,000	$ 700,000,000
Debt instrument, unamortized premium	6,147,000	6,686,000
Total Debt	$ 706,147,000	$ 706,686,000
Senior Notes due January 2029
Debt Instrument [Line Items]
Stated rate, debt instrument	6.00%	6.00%
Total Debt	$ 500,000,000	$ 500,000,000
Senior Notes Due March 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	6.50%	6.50%
Debt instrument, face amount	$ 400,000,000	$ 400,000,000
Debt instrument, unamortized discount	3,500,000	3,875,000
Total Debt	$ 396,500,000	$ 396,125,000
Convertible Senior Notes Due May 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	2.25%	2.25%
Debt instrument, face amount	$ 345,000,000	$ 345,000,000
Debt instrument, unamortized discount	99,695,000	107,735,000
Total Debt	245,305,000	237,265,000
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]
Total Debt	160,000,000	291,000,000
Revolving Credit Facility | CNX Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	160,000,000	160,800,000
Line of Credit
Debt Instrument [Line Items]
Debt instrument, face amount			$ 175,000,000
Line of Credit | Cardinal States Gathering Company Credit Facility maturing in March 2028
Debt Instrument [Line Items]
Debt instrument, face amount	107,705,000	114,985,000
Debt instrument, unamortized discount	1,048,000	1,126,000
Total Debt	106,657,000	113,859,000
Line of Credit | CSG Holdings II LLC Credit Facility maturing in March 2027
Debt Instrument [Line Items]
Debt instrument, face amount	39,726,000	45,559,000
Debt instrument, unamortized discount	408,000	441,000
Total Debt	$ 39,318,000	$ 45,118,000

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