Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net (Loss) Income	$ (13,214)	$ 93,558	$ 178,785
Adjustments to Reconcile Net (Loss) Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization	210,760	207,097	201,264
Stock/Unit-Based Compensation	11,579	12,760	10,235
Gain on Sale of Assets	(15,295)	(1,995)	(565)
Amortization of Debt Issuance Costs	7,447	6,416	8,858
(Gain) Loss on Debt Extinguishment	(21,352)	24,455	3,922
Deferred Income Taxes	11,685	(17,419)	(16,482)
Equity in Earnings of Affiliates	1,251	0	0
Changes in Operating Assets:
Trade and Other Receivables	11,130	(38,960)	39,157
Inventories	(2,069)	(5,485)	4,774
Prepaid Expenses and Other Assets	7,574	497	(7,307)
Changes in Other Assets	(21,058)	17,302	15,583
Changes in Operating Liabilities:
Accounts Payable	(30,759)	(21,714)	37,488
Other Operating Liabilities	(2,915)	(7,884)	(38,659)
Changes in Other Liabilities	(25,433)	(24,062)	(23,528)
Net Cash Provided by Operating Activities	129,331	244,566	413,525
Cash Flows from Investing Activities:
Capital Expenditures	(86,004)	(169,739)	(145,749)
Proceeds from Sales of Assets	9,899	2,201	2,103
Other Investing Activity	(229)	(5,003)	(10,000)
Net Cash Used in Investing Activities	(76,334)	(172,541)	(153,646)
Cash Flows from Financing Activities:
Proceeds from Finance Lease Obligations	19,314	0	0
Payments on Finance Lease Obligations	(28,295)	(18,549)	(15,484)
Distributions to Noncontrolling Interest	(5,575)	(22,220)	(22,265)
Shares/Units Withheld for Taxes	(863)	(4,963)	(3,424)
Repurchases of Common Stock	0	(32,733)	(25,839)
Spin Distribution to CNX Resources Corporation	0	0	(18,234)
Debt Issuance and Financing Fees	(9,002)	(12,492)	(2,166)
Net Cash Used in Financing Activities	(82,440)	(256,667)	(148,923)
Net (Decrease) Increase in Cash and Cash Equivalents and Restricted Cash	(29,443)	(184,642)	110,956
Cash and Cash Equivalents and Restricted Cash at Beginning of Period	80,293	264,935	153,979
Cash and Cash Equivalents and Restricted Cash at End of Period	50,850	80,293	264,935
CONSOL Coal Resources L P [Member]
Cash Flows from Financing Activities:
Repurchases of Common Stock	0	(369)	(3,079)
Term Loan A Facility [Member]
Cash Flows from Financing Activities:
Proceeds from Debt	0	26,250	0
Payments on Debt	(22,500)	(11,250)	(26,250)
Term Loan B Facility [Member]
Cash Flows from Financing Activities:
Payments on Debt	(2,750)	(124,437)	(4,000)
Senior Secured Second Lien Notes due 2025 [Member]
Cash Flows from Financing Activities:
Payments on Debt	(32,064)	(59,421)	(28,182)
Other Asset Backed Financing [Member]
Cash Flows from Financing Activities:
Proceeds from Debt	0	3,757	0
Payments on Debt	$ (705)	$ (240)	$ 0