Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities:
Net Income (Loss)	$ 883,111	$ 380,747	$ (848,102)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Continuing Operating Activities:
Net (Income) Loss from Discontinued Operations	0	(85,708)	297,157
Depreciation, Depletion and Amortization	493,423	412,036	419,939
Amortization of Deferred Financing Costs	8,361	10,630	9,059
Impairment of Exploration and Production Properties	0	137,865	0
Impairment of Other Intangible Assets	18,650	0	0
Stock-Based Compensation	21,341	16,983	19,316
Gain on Sale of Assets	(157,015)	(188,063)	(14,270)
Gain on Previously Held Equity Interest	(623,663)	0	0
Loss on Debt Extinguishment	54,118	2,129	0
Loss (Gain) on Commodity Derivative Instruments	30,212	(206,930)	141,021
Net Cash (Paid) Received in Settlement of Commodity Derivative Instruments	(69,720)	(41,174)	245,212
Deferred Income Taxes	345,560	(142,829)	75,892
Return on Equity Investment	0	0	22,268
Equity in Earnings of Affiliates	(5,363)	(49,830)	(53,078)
Changes in Operating Assets:
Accounts and Notes Receivable	(57,734)	(32,792)	(46,434)
Supplies Inventories	1,027	4,254	(1,486)
Recoverable Income Tax	(118,498)	76,196	(91,313)
Prepaid Expenses	(1,391)	631	76,668
Changes in Other Assets	4,904	22,018	(2,473)
Changes in Operating Liabilities:
Accounts Payable	12,760	45,669	(17,227)
Accrued Interest	(5,839)	(2,955)	(1,144)
Other Operating Liabilities	53,135	81,969	(41,913)
Changes in Other Liabilities	(1,556)	(7,778)	78,140
Net Cash Provided by Continuing Operating Activities	885,823	433,068	267,232
Net Cash Provided by Discontinued Operating Activities	0	215,619	197,026
Net Cash Provided by Operating Activities	885,823	648,687	464,258
Cash Flows from Investing Activities:
Capital Expenditures	(1,116,397)	(632,846)	(172,739)
CNX Gathering LLC Acquisition, Net of Cash Acquired	(299,272)	0	0
Proceeds from Noble Exchange Settlement	0	0	213,295
Proceeds from Asset Sales	511,767	414,185	46,989
Net Distributions from Equity Affiliates	9,250	42,873	73,743
Net Cash (Used in) Provided by Continuing Investing Activities	(894,652)	(175,788)	161,288
Net Cash (Used in) Provided by Discontinued Investing Activities	0	(46,133)	326,083
Net Cash (Used in) Provided by Investing Activities	(894,652)	(221,921)	487,371
Cash Flows from Financing Activities:
Proceeds from CNX Revolving Credit Facility	612,000	0
Payments on CNX Revolving Credit Facility			(952,000)
Payments on Miscellaneous Borrowings	(7,165)	(8,037)	(7,802)
Payments on Long-Term Notes	(955,019)	(239,716)	0
Proceeds from Issuance of CNXM Senior Notes	394,000	0	0
Net Payments on CNXM Revolving Credit Facility	(65,500)	0	0
Distributions to CNXM Noncontrolling Interest Holders	(55,433)	0	0
Proceeds from Spin-Off of CONSOL Energy Inc.	0	425,000	0
Dividends Paid	0	0	(2,294)
Proceeds from Issuance of Common Stock	1,713	1,009	4
Shares Withheld for Taxes	(5,385)	(6,681)	(1,649)
Purchases of Common Stock	(381,752)	(103,209)	0
Debt Issuance and Financing Fees	(20,599)	(361)	0
Net Cash (Used in) Provided by Continuing Financing Activities	(483,140)	68,005	(963,741)
Net Cash Used in Discontinued Financing Activities	0	(31,903)	(6,663)
Net Cash (Used in) Provided by Financing Activities	(483,140)	36,102	(970,404)
Net (Decrease) Increase in Cash and Cash Equivalents	(491,969)	462,868	(18,775)
Cash and Cash Equivalents at Beginning of Period	509,167	46,299	65,074
Cash and Cash Equivalents at End of Period	$ 17,198	$ 509,167	$ 46,299