Supplemental Gas Data Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Production Revenue	$ 751,767	$ 745,809	$ 630,598
Sales-Gas Royalty Interests	66,929	62,869	40,951
Sales-Purchased Gas	4,344	11,227	7,040
Total Revenue	823,040	819,905	678,589
Lifting Costs	131,184	87,155	55,285
Gathering Costs	142,339	127,927	95,687
Gas Royalty Interests Costs	59,331	53,775	32,376
Other Costs	62,302	63,941	45,795
Purchased Gas Costs	3,831	9,736	6,442
DD&A	206,821	190,424	107,251
Total Costs	605,854	533,022	342,883
Pre-tax Operating Income	217,186	286,883	335,706
Income Taxes	86,961	117,278	125,890
Results of Operations for Producing Activities excluding Corporate and Interest Costs	130,225	169,605	209,816
Cnx Gas Guarantor [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Sales-Gas Royalty Interests	66,929	62,869	40,951
Sales-Purchased Gas	4,344	11,227	7,040
Gas Royalty Interests Costs	59,377	53,839	32,423
Purchased Gas Costs	$ 3,831	$ 9,736	$ 6,442