Supplemental Gas Data Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Production Revenue	$ 793,673	$ 728,458	$ 1,007,381
Gain (Loss) on Hedging Activity	(141,021)	392,942	23,193
Gas Royalty Interests and Purchased Gas Sales	43,256	14,450	8,999
Total Revenue	695,908	1,135,850	1,039,573
Lifting Costs	96,434	121,847	139,242
Production Tax Expense	31,049	30,438	39,418
Gathering Costs	374,350	343,403	239,591
E&P Direct Administration and Selling	14,519	10,120	22,718
Other Costs		370,374	323,600
Impairment of Oil and Gas Properties	0	828,905	0
DD&A	976,922	1,715,808	771,820
Total Costs	(281,014)	(579,958)	267,753
Pre-tax Operating Income	(69,308)	(250,220)	45,162
Income Taxes	(211,706)	(329,738)	222,591
Cnx Gas Guarantor [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Gain (Loss) on Hedging Activity	(141,021)	392,942	23,193
Gas Royalty Interests and Purchased Gas Sales	43,256	14,450	8,999
Production Tax Expense	31,049	30,438	39,418
Gain (Loss) on Sale of Assets	42,717	10,721	7,251
Other Costs	417,853
Impairment of Oil and Gas Properties	$ 0	$ 828,905	$ 0