GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			$ 223,183	$ 330,252
Cash Flows from Investing Activities:
Capital Expenditures	$ (48,521)	$ (40,656)	(131,475)	(96,855)
Proceeds from Sales of Assets			2,015	1,368
(Investments in), net of Distributions from, Subsidiaries			0	0
Net Cash Used in Investing Activities			(129,460)	(95,487)
Cash Flows from Financing Activities:
Payments on Finance Leases			(13,784)
Payments on Finance Leases				(11,019)
Net (Payments on) Proceeds from Related Party Long-Term Notes			0	0
Repurchases of Common Stock			(31,318)	(9,724)
Spin Distribution to CNX Resources			0	(18,234)
Distributions to Noncontrolling Interest			(16,674)	(16,763)
Shares/Units Withheld for Taxes			(4,745)	(2,923)
Debt-Related Financing Fees			(20,628)	(2,851)
Net Cash Used in Financing Activities			(223,809)	(112,430)
Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			26,250	0
Payments on Term Loan A			(7,500)	(26,250)
Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			(123,750)	(3,000)
Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			(35,048)	(20,524)
Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			3,757	0
Elimination
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			0	0
Cash Flows from Investing Activities:
Capital Expenditures			0	0
Proceeds from Sales of Assets			0	0
(Investments in), net of Distributions from, Subsidiaries			(26,540)	(26,278)
Net Cash Used in Investing Activities			(26,540)	(26,278)
Cash Flows from Financing Activities:
Payments on Finance Leases			0
Payments on Finance Leases				0
Net (Payments on) Proceeds from Related Party Long-Term Notes			0	0
Repurchases of Common Stock			0	0
Spin Distribution to CNX Resources				0
Distributions to Noncontrolling Interest			26,540	26,278
Shares/Units Withheld for Taxes			0	0
Debt-Related Financing Fees			0	0
Net Cash Used in Financing Activities			26,540	26,278
Elimination | Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			0
Payments on Term Loan A			0	0
Elimination | Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Elimination | Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Elimination | Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			0
Parent Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			182,938	(45,278)
Cash Flows from Investing Activities:
Capital Expenditures			0	0
Proceeds from Sales of Assets			0	0
(Investments in), net of Distributions from, Subsidiaries			(146,896)	30,237
Net Cash Used in Investing Activities			(146,896)	30,237
Cash Flows from Financing Activities:
Payments on Finance Leases			0
Payments on Finance Leases				0
Net (Payments on) Proceeds from Related Party Long-Term Notes			(18,400)	29,583
Repurchases of Common Stock			(31,318)	(9,724)
Spin Distribution to CNX Resources				0
Distributions to Noncontrolling Interest			0	0
Shares/Units Withheld for Taxes			0	0
Debt-Related Financing Fees			(20,628)	(2,851)
Net Cash Used in Financing Activities			(206,318)	(33,908)
Parent Issuer | Reportable Legal Entities | Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			26,250
Payments on Term Loan A			(7,500)	(26,250)
Parent Issuer | Reportable Legal Entities | Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			(123,062)	(3,000)
Parent Issuer | Reportable Legal Entities | Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			(35,048)	(20,524)
Parent Issuer | Reportable Legal Entities | Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			3,757
Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			(27,260)	280,396
Cash Flows from Investing Activities:
Capital Expenditures			(102,121)	(76,599)
Proceeds from Sales of Assets			2,011	1,198
(Investments in), net of Distributions from, Subsidiaries			173,436	(3,959)
Net Cash Used in Investing Activities			73,326	(79,360)
Cash Flows from Financing Activities:
Payments on Finance Leases			(10,931)
Payments on Finance Leases				(8,894)
Net (Payments on) Proceeds from Related Party Long-Term Notes			0	0
Repurchases of Common Stock			0	0
Spin Distribution to CNX Resources				(18,234)
Distributions to Noncontrolling Interest			0	0
Shares/Units Withheld for Taxes			(3,865)	(2,011)
Debt-Related Financing Fees			0	0
Net Cash Used in Financing Activities			(15,484)	(29,139)
Guarantor | Reportable Legal Entities | Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			0
Payments on Term Loan A			0	0
Guarantor | Reportable Legal Entities | Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			(688)	0
Guarantor | Reportable Legal Entities | Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Guarantor | Reportable Legal Entities | Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			0
Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			0	0
Cash Flows from Investing Activities:
Capital Expenditures			0	0
Proceeds from Sales of Assets			0	0
(Investments in), net of Distributions from, Subsidiaries			0	0
Net Cash Used in Investing Activities			0	0
Cash Flows from Financing Activities:
Payments on Finance Leases			0
Payments on Finance Leases				0
Net (Payments on) Proceeds from Related Party Long-Term Notes			0	0
Repurchases of Common Stock			0	0
Spin Distribution to CNX Resources				0
Distributions to Noncontrolling Interest			0	0
Shares/Units Withheld for Taxes			0	0
Debt-Related Financing Fees			0	0
Net Cash Used in Financing Activities			0	0
Non-Guarantor | Reportable Legal Entities | Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			0
Payments on Term Loan A			0	0
Non-Guarantor | Reportable Legal Entities | Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Non-Guarantor | Reportable Legal Entities | Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Non-Guarantor | Reportable Legal Entities | Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			0
Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities			67,505	95,134
Cash Flows from Investing Activities:
Capital Expenditures			(29,354)	(20,256)
Proceeds from Sales of Assets			4	170
(Investments in), net of Distributions from, Subsidiaries			0	0
Net Cash Used in Investing Activities			(29,350)	(20,086)
Cash Flows from Financing Activities:
Payments on Finance Leases			(2,853)
Payments on Finance Leases				(2,125)
Net (Payments on) Proceeds from Related Party Long-Term Notes			18,400	(29,583)
Repurchases of Common Stock			0	0
Spin Distribution to CNX Resources				0
Distributions to Noncontrolling Interest			(43,214)	(43,041)
Shares/Units Withheld for Taxes			(880)	(912)
Debt-Related Financing Fees			0	0
Net Cash Used in Financing Activities			(28,547)	(75,661)
Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities | Term Loan A
Cash Flows from Financing Activities:
Proceeds from loans			0
Payments on Term Loan A			0	0
Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities | Term Loan B
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities | Senior Secured Second Lien Notes due 2025
Cash Flows from Financing Activities:
Proceeds from (Payments on) loans			0	0
Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities | Other Asset-Backed Financing
Cash Flows from Financing Activities:
Proceeds from loans			0
Consol Coal Resources LP Units
Cash Flows from Financing Activities:
Repurchases of Common Stock			(369)	(1,142)
Consol Coal Resources LP Units | Elimination
Cash Flows from Financing Activities:
Repurchases of Common Stock			0	0
Consol Coal Resources LP Units | Parent Issuer | Reportable Legal Entities
Cash Flows from Financing Activities:
Repurchases of Common Stock			(369)	(1,142)
Consol Coal Resources LP Units | Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Repurchases of Common Stock			0	0
Consol Coal Resources LP Units | Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Repurchases of Common Stock			0	0
Consol Coal Resources LP Units | Non-Guarantor | CCR Non-Guarantor | Reportable Legal Entities
Cash Flows from Financing Activities:
Repurchases of Common Stock			$ 0	$ 0