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Guarantor Subsidiaries Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										$ 793,248	$ 726,921	$ 1,004,924
Gain (Loss) on Hedging Activity										(141,021)	392,942	23,193
Coal Products and Services Revenue										1,065,582	1,289,036	1,616,874
Other Revenue, Net										32,038	30,967	276,242
Gas Royalty Interests and Purchased Gas Sales										43,256	14,450	8,999
Freight-Outside	$ 12,519	$ 9,392	$ 10,295	$ 11,447	$ 13,110	$ 2,436	$ 2,750	$ 5,018		46,468	20,499	23,133
Other Income										167,306	144,351	207,460
Gain (Loss) on Disposition of Assets										19,498	74,173	43,198
Oil and Gas Property, Lease Operating Expense										96,434	121,847	139,242
Gas Gathering, Transportation, Marketing and Processing Costs										374,350	343,403	239,579
Production Tax Expense										31,049	30,438	39,418
E&P Depreciation, Depletion, and Amortization										417,853	370,374	323,600
Exploration and Production Costs										14,519	10,120	23,355
Production Royalty Interests and Purchased Gas Costs										42,717	10,721	7,251
Income (Loss) from Continuing Operations before Income Taxes, Domestic										(525,955)	(475,705)	180,151
Other Expenses										87,913	65,939	46,838
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										102,503	102,229	128,731
Oil and Gas Production Expense										1,167,338	1,883,976	948,014
Operating Expenses										733,300	666,302	982,749
Coal Depreciation, Depletion, Amortization										168,195	176,864	173,316
Freight Expense	12,519	9,392	10,295	11,447	13,110	2,436	2,750	5,018		46,468	20,499	23,133
General and Administrative Expense										37,512	40,843	68,597
Cost of Coal Products and Services										985,475	904,508	1,247,795
Other Nonoperating Income (Expense)												460,429
Other Nonoperating Expense										182,869	78,743	460,429
Other General and Administrative Expense										12,717	14,918	13,307
Depreciation, Depletion and Amortization, Nonproduction										12,455	19,882	35,727
Gains (Losses) on Extinguishment of Debt										0	67,751	95,267
Interest Expense										191,476	199,266	223,333
Other General Expense										399,517	380,560	828,063
Total Costs										2,552,330	3,169,044	3,023,872
Income Taxes										10,010	(125,439)	15,204
Income (Loss) from Continuing Operations Attributable to Parent	(321,198)	62,568	45,342	(234,044)	(43,291)	129,312	(577,884)	52,964		(544,919)	(360,676)	164,947
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										(535,965)	(350,266)	164,947
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										(303,183)	(14,209)	(1,857)
Net Income (Loss)									$ (839,148)	(839,148)	(364,475)	163,090
Net Income (Loss) Attributable to Noncontrolling Interest										8,954	10,410	0
Net Income Attributable to CONSOL Energy Inc Shareholders	$ (306,047)	$ 25,345	$ 30,405	$ (469,828)	$ (97,572)	$ 118,980	$ (603,301)	$ 79,031		(848,102)	(374,885)	163,090
Impairment of Oil and Gas Properties										0	828,905	0
Revenues										2,026,375	2,693,339	3,204,023
Parent Company [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										0	0	0
Gain (Loss) on Hedging Activity										0	0	0
Coal Products and Services Revenue										0	0	0
Other Revenue, Net										0	0	0
Gas Royalty Interests and Purchased Gas Sales										0	0	0
Freight-Outside										0	0	0
Other Income										(712,927)	(172,450)	420,030
Gain (Loss) on Disposition of Assets										0	0	0
Oil and Gas Property, Lease Operating Expense										0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs										0	0	0
Production Tax Expense										0	0	0
E&P Depreciation, Depletion, and Amortization										0	0	0
Exploration and Production Costs										0	0	0
Production Royalty Interests and Purchased Gas Costs										0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic										(930,355)	(496,155)	10,678
Other Expenses										0	0	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										0	0	0
Oil and Gas Production Expense										0	0	0
Operating Expenses										0	0	0
Coal Depreciation, Depletion, Amortization										0	0	0
Freight Expense										0	0	0
General and Administrative Expense										0	0	0
Cost of Coal Products and Services										0	0	0
Other Nonoperating Income (Expense)												99,273
Other Nonoperating Expense										43,533	69,059
Other General and Administrative Expense										0	0	788
Depreciation, Depletion and Amortization, Nonproduction										568	604	640
Gains (Losses) on Extinguishment of Debt											67,751	95,267
Interest Expense										173,327	186,291	213,384
Other General Expense										217,428	323,705	409,352
Total Costs										217,428	323,705	409,352
Income Taxes										(82,253)	(121,270)	(152,412)
Income (Loss) from Continuing Operations Attributable to Parent												163,090
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										(848,102)	(374,885)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										0	0	0
Net Income (Loss)										(848,102)	(374,885)	163,090
Net Income (Loss) Attributable to Noncontrolling Interest										0	0
Net Income Attributable to CONSOL Energy Inc Shareholders										(848,102)	(374,885)	163,090
Impairment of Oil and Gas Properties											0
Revenues										(712,927)	(172,450)	420,030
Cnx Gas Guarantor [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										793,672	728,458	1,007,381
Gain (Loss) on Hedging Activity										(141,021)	392,942	23,193
Coal Products and Services Revenue										0	0	0
Other Revenue, Net										0	0	0
Gas Royalty Interests and Purchased Gas Sales										43,256	14,450	8,999
Freight-Outside										0	0	0
Other Income										80,444	62,340	60,634
Gain (Loss) on Disposition of Assets										14,870	12,540	45,917
Oil and Gas Property, Lease Operating Expense										96,434	121,847	139,242
Gas Gathering, Transportation, Marketing and Processing Costs										374,350	343,403	239,591
Production Tax Expense										31,049	30,438	39,418
E&P Depreciation, Depletion, and Amortization										417,853	370,374	323,600
Exploration and Production Costs										14,519	10,120	22,718
Production Royalty Interests and Purchased Gas Costs										42,717	10,721	7,251
Income (Loss) from Continuing Operations before Income Taxes, Domestic										(378,840)	(678,859)	189,714
Other Expenses										87,913	65,939	46,838
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										102,503	102,229	128,731
Oil and Gas Production Expense										1,167,338	1,883,976	947,389
Operating Expenses										0	0	0
Coal Depreciation, Depletion, Amortization										0	0	0
Freight Expense										0	0	0
General and Administrative Expense										0	0	0
Cost of Coal Products and Services										0	0	0
Other Nonoperating Income (Expense)												0
Other Nonoperating Expense										0	0
Other General and Administrative Expense										0	0	0
Depreciation, Depletion and Amortization, Nonproduction										0	0	0
Gains (Losses) on Extinguishment of Debt											0	0
Interest Expense										2,723	5,613	9,021
Other General Expense										2,723	5,613	9,021
Total Costs										1,170,061	1,889,589	956,410
Income Taxes										(150,551)	(257,056)	66,441
Income (Loss) from Continuing Operations Attributable to Parent												123,273
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										(228,289)	(421,803)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										0	0	0
Net Income (Loss)										(228,289)	(421,803)	123,273
Net Income (Loss) Attributable to Noncontrolling Interest										0	0
Net Income Attributable to CONSOL Energy Inc Shareholders										(228,289)	(421,803)	123,273
Impairment of Oil and Gas Properties										0	828,905	0
Revenues										791,221	1,210,730	1,146,124
Other Guarantors Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										0	0	0
Gain (Loss) on Hedging Activity										0	0	0
Coal Products and Services Revenue										799,187	966,775	1,212,627
Other Revenue, Net										32,038	30,967	41,255
Gas Royalty Interests and Purchased Gas Sales										0	0	0
Freight-Outside										34,865	16,690	18,941
Other Income										83,735	82,690	138,201
Gain (Loss) on Disposition of Assets										4,637	61,572	(2,926)
Oil and Gas Property, Lease Operating Expense										0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs										0	0	0
Production Tax Expense										0	0	0
E&P Depreciation, Depletion, and Amortization										0	0	0
Exploration and Production Costs										0	0	637
Production Royalty Interests and Purchased Gas Costs										0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic										44,934	457,198	279,550
Other Expenses										0	0	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										0	0	0
Oil and Gas Production Expense										0	0	637
Operating Expenses										550,299	472,341	742,886
Coal Depreciation, Depletion, Amortization										126,201	132,728	129,979
Freight Expense										34,865	16,690	12,575
General and Administrative Expense										27,563	29,912	57,814
Cost of Coal Products and Services										738,928	651,671	943,254
Other Nonoperating Income (Expense)												129,257
Other Nonoperating Expense										139,289	9,176
Other General and Administrative Expense										12,717	14,918	12,519
Depreciation, Depletion and Amortization, Nonproduction										11,887	19,278	33,273
Gains (Losses) on Extinguishment of Debt											0	0
Interest Expense										6,707	6,453	9,608
Other General Expense										170,600	49,825	184,657
Total Costs										909,528	701,496	1,128,548
Income Taxes										242,832	251,558	96,926
Income (Loss) from Continuing Operations Attributable to Parent												182,624
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										(197,898)	205,640
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										0	0	0
Net Income (Loss)										(197,898)	205,640	182,624
Net Income (Loss) Attributable to Noncontrolling Interest										0	0
Net Income Attributable to CONSOL Energy Inc Shareholders										(197,898)	205,640	182,624
Impairment of Oil and Gas Properties											0
Revenues										954,462	1,158,694	1,408,098
Non-Guarantor Subsidiaries [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										0	0	0
Gain (Loss) on Hedging Activity										0	0	0
Coal Products and Services Revenue										0	0	0
Other Revenue, Net										0	0	234,987
Gas Royalty Interests and Purchased Gas Sales										0	0	0
Freight-Outside										0	0	0
Other Income										0	4,105	10,305
Gain (Loss) on Disposition of Assets										0	0	22
Oil and Gas Property, Lease Operating Expense										0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs										0	0	0
Production Tax Expense										0	0	0
E&P Depreciation, Depletion, and Amortization										0	0	0
Exploration and Production Costs										0	9	119
Production Royalty Interests and Purchased Gas Costs										0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic										(47)	3,512	11,237
Other Expenses										0	0	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										0	0	0
Oil and Gas Production Expense										0	9	119
Operating Expenses										0	0	0
Coal Depreciation, Depletion, Amortization										0	0	0
Freight Expense										0	0	6,366
General and Administrative Expense										0	0	(6,366)
Cost of Coal Products and Services										0	0	0
Other Nonoperating Income (Expense)												231,899
Other Nonoperating Expense										47	508
Other General and Administrative Expense										0	0	0
Depreciation, Depletion and Amortization, Nonproduction										0	0	1,814
Gains (Losses) on Extinguishment of Debt											0	0
Interest Expense										0	76	245
Other General Expense										47	584	233,958
Total Costs										47	593	234,077
Income Taxes										(18)	1,329	4,249
Income (Loss) from Continuing Operations Attributable to Parent												6,988
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										(29)	2,183
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										(303,183)	(14,209)	(1,857)
Net Income (Loss)										(303,212)	(12,026)	5,131
Net Income (Loss) Attributable to Noncontrolling Interest										0	0
Net Income Attributable to CONSOL Energy Inc Shareholders										(303,212)	(12,026)	5,131
Impairment of Oil and Gas Properties											0
Revenues										0	4,105	245,314
CNX Coal Resources LP [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										0	0	0
Gain (Loss) on Hedging Activity										0	0	0
Coal Products and Services Revenue										266,395	322,261	404,247
Other Revenue, Net										0	0	0
Gas Royalty Interests and Purchased Gas Sales										0	0	0
Freight-Outside										11,603	3,809	4,192
Other Income										3,128	880	9,475
Gain (Loss) on Disposition of Assets										(9)	61	185
Oil and Gas Property, Lease Operating Expense										0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs										0	0	0
Production Tax Expense										0	0	0
E&P Depreciation, Depletion, and Amortization										0	0	0
Exploration and Production Costs										0	0	0
Production Royalty Interests and Purchased Gas Costs										0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic										25,851	64,538	104,875
Other Expenses										0	0	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										0	0	0
Oil and Gas Production Expense										0	0	0
Operating Expenses										183,001	193,961	239,863
Coal Depreciation, Depletion, Amortization										41,994	44,136	43,337
Freight Expense										11,603	3,809	4,192
General and Administrative Expense										9,949	10,931	17,149
Cost of Coal Products and Services										246,547	252,837	304,541
Other Nonoperating Income (Expense)												0
Other Nonoperating Expense										0	0
Other General and Administrative Expense										0	0	0
Depreciation, Depletion and Amortization, Nonproduction										0	0	0
Gains (Losses) on Extinguishment of Debt											0	0
Interest Expense										8,719	9,636	8,683
Other General Expense										8,719	9,636	8,683
Total Costs										255,266	262,473	313,224
Income Taxes										0	0	0
Income (Loss) from Continuing Operations Attributable to Parent												104,875
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										25,851	64,538
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										0	0	0
Net Income (Loss)										25,851	64,538	104,875
Net Income (Loss) Attributable to Noncontrolling Interest										0	0
Net Income Attributable to CONSOL Energy Inc Shareholders										25,851	64,538	104,875
Impairment of Oil and Gas Properties											0
Revenues										281,117	327,011	418,099
Consolidation, Eliminations [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Oil and Gas Sales Revenue										(424)	(1,537)	(2,457)
Gain (Loss) on Hedging Activity										0	0	0
Coal Products and Services Revenue										0	0	0
Other Revenue, Net										0	0	0
Gas Royalty Interests and Purchased Gas Sales										0	0	0
Freight-Outside										0	0	0
Other Income										712,926	166,786	(431,185)
Gain (Loss) on Disposition of Assets										0	0	0
Oil and Gas Property, Lease Operating Expense										0	0	0
Gas Gathering, Transportation, Marketing and Processing Costs										0	0	(12)
Production Tax Expense										0	0	0
E&P Depreciation, Depletion, and Amortization										0	0	0
Exploration and Production Costs										0	(9)	(119)
Production Royalty Interests and Purchased Gas Costs										0	0	0
Income (Loss) from Continuing Operations before Income Taxes, Domestic										712,502	174,061	(415,903)
Other Expenses										0	0	0
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities										0	0	0
Oil and Gas Production Expense										0	(9)	(131)
Operating Expenses										0	0	0
Coal Depreciation, Depletion, Amortization										0	0	0
Freight Expense										0	0	0
General and Administrative Expense										0	0	0
Cost of Coal Products and Services										0	0	0
Other Nonoperating Income (Expense)												0
Other Nonoperating Expense										0	0
Other General and Administrative Expense										0	0	0
Depreciation, Depletion and Amortization, Nonproduction										0	0	0
Gains (Losses) on Extinguishment of Debt											0	0
Interest Expense										0	(8,803)	(17,608)
Other General Expense										0	(8,803)	(17,608)
Total Costs										0	(8,812)	(17,739)
Income Taxes										0	0	0
Income (Loss) from Continuing Operations Attributable to Parent												(415,903)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest										712,502	174,061
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent										0	0	0
Net Income (Loss)										712,502	174,061	(415,903)
Net Income (Loss) Attributable to Noncontrolling Interest										8,954	10,410
Net Income Attributable to CONSOL Energy Inc Shareholders										703,548	163,651	(415,903)
Impairment of Oil and Gas Properties											0
Revenues										$ 712,502	$ 165,249	$ (433,642)

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