Supplemental Gas Data Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Production Revenue	$ 1,030,574	$ 740,869	$ 660,442
Sales-Gas Royalty Interests	82,428	63,202	49,405
Sales-Purchased Gas	8,999	6,531	3,316
Total Revenue	1,122,001	810,602	713,163
Lifting Costs	118,391	96,601	90,837
Production Tax Expense	39,418	28,676	26,145
Gathering Costs	258,110	201,024	160,579
E&P Direct Administration and Selling	55,092	49,092	47,565
Other Costs		61,107	39,029
Purchased Gas Costs	7,251	4,837	2,711
DD&A	314,381	231,809	205,149
Total Costs	885,308	726,215	610,937
Pre-tax Operating Income	236,693	84,387	102,226
Income Taxes	82,894	32,067	38,989
Results of Operations for Producing Activities excluding Corporate and Interest Costs	153,799	52,320	63,237
Cnx Gas Guarantor [Member]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Production Tax Expense	39,418	28,676	26,145
Gain (Loss) on Sale of Assets	69,946	53,069	38,922
E&P Direct Administration and Selling	55,092	49,092	47,565
Other Costs	$ 22,719